The Project Gutenberg EBook of Note on the Resemblances and Differences in
the Structure and the Development of Brain in Man and the Apes, by Thomas Henry Huxley

This eBook is for the use of anyone anywhere at no cost and with
almost no restrictions whatsoever.  You may copy it, give it away or
re-use it under the terms of the Project Gutenberg License included
with this eBook or online at www.gutenberg.net


Title: Note on the Resemblances and Differences in the Structure and the Development of Brain in Man and the Apes

Author: Thomas Henry Huxley

Posting Date: November 5, 2008 [EBook #2354]
Release Date: October, 2000

Language: English

Character set encoding: ASCII

*** START OF THIS PROJECT GUTENBERG EBOOK RESEMBLANCES-DIFFERENCES OF BRAIN ***




Produced by Sue Asscher.  HTML version by Al Haines.










  NOTE ON THE RESEMBLANCES AND DIFFERENCES IN THE STRUCTURE
  AND THE DEVELOPMENT OF THE BRAIN IN MAN AND APES


BY

PROFESSOR T. H. HUXLEY, F.R.S.


[This essay is taken from 'The Descent of Man and Selection in relation
to Sex' by Charles Darwin where it appears at the end of Chapter VII
which is also the end of Part I.  Footnotes are numbered as they appear
in 'The Descent of Man.']



The controversy respecting the nature and the extent of the differences
in the structure of the brain in man and the apes, which arose some
fifteen years ago, has not yet come to an end, though the subject
matter of the dispute is, at present, totally different from what it
was formerly.  It was originally asserted and re-asserted, with
singular pertinacity, that the brain of all the apes, even the highest,
differs from that of man, in the absence of such conspicuous structures
as the posterior lobes of the cerebral hemispheres, with the posterior
cornu of the lateral ventricle and the hippocampus minor, contained in
those lobes, which are so obvious in man.

But the truth that the three structures in question are as well
developed in apes' as in human brains, or even better; and that it is
characteristic of all the Primates (if we exclude the Lemurs) to have
these parts well developed, stands at present on as secure a basis as
any proposition in comparative anatomy. Moreover, it is admitted by
every one of the long series of anatomists who, of late years, have
paid special attention to the arrangement of the complicated sulci and
gyri which appear upon the surface of the cerebral hemispheres in man
and the higher apes, that they are disposed after the very same pattern
in him, as in them.  Every principal gyrus and sulcus of a chimpanzee's
brain is clearly represented in that of a man, so that the terminology
which applies to the one answers for the other.  On this point there is
no difference of opinion.  Some years since, Professor Bischoff
published a memoir (70.  'Die Grosshirn-Windungen des Menschen;'
'Abhandlungen der K. Bayerischen Akademie,' B. x. 1868.) on the
cerebral convolutions of man and apes; and as the purpose of my learned
colleague was certainly not to diminish the value of the differences
between apes and men in this respect, I am glad to make a citation from
him.

"That the apes, and especially the orang, chimpanzee and gorilla, come
very close to man in their organisation, much nearer than to any other
animal, is a well known fact, disputed by nobody. Looking at the matter
from the point of view of organisation alone, no one probably would
ever have disputed the view of Linnaeus, that man should be placed,
merely as a peculiar species, at the head of the mammalia and of those
apes.  Both shew, in all their organs, so close an affinity, that the
most exact anatomical investigation is needed in order to demonstrate
those differences which really exist.  So it is with the brains. The
brains of man, the orang, the chimpanzee, the gorilla, in spite of all
the important differences which they present, come very close to one
another" (loc. cit. p. 101).

There remains, then, no dispute as to the resemblance in fundamental
characters, between the ape's brain and man's:  nor any as to the
wonderfully close similarity between the chimpanzee, orang and man, in
even the details of the arrangement of the gyri and sulci of the
cerebral hemispheres.  Nor, turning to the differences between the
brains of the highest apes and that of man, is there any serious
question as to the nature and extent of these differences.  It is
admitted that the man's cerebral hemispheres are absolutely and
relatively larger than those of the orang and chimpanzee; that his
frontal lobes are less excavated by the upward protrusion of the roof
of the orbits; that his gyri and sulci are, as a rule, less
symmetrically disposed, and present a greater number of secondary
plications.  And it is admitted that, as a rule, in man, the
temporo-occipital or "external perpendicular" fissure, which is usually
so strongly marked a feature of the ape's brain is but faintly marked.
But it is also clear, that none of these differences constitutes a
sharp demarcation between the man's and the ape's brain.  In respect to
the external perpendicular fissure of Gratiolet, in the human brain for
instance, Professor Turner remarks:  (71.  'Convolutions of the Human
Cerebrum Topographically Considered,' 1866, p. 12.)

"In some brains it appears simply as an indentation of the margin of
the hemisphere, but, in others, it extends for some distance more or
less transversely outwards.  I saw it in the right hemisphere of a
female brain pass more than two inches outwards; and on another
specimen, also the right hemisphere, it proceeded for four-tenths of an
inch outwards, and then extended downwards, as far as the lower margin
of the outer surface of the hemisphere.  The imperfect definition of
this fissure in the majority of human brains, as compared with its
remarkable distinctness in the brain of most Quadrumana, is owing to
the presence, in the former, of certain superficial, well marked,
secondary convolutions which bridge it over and connect the parietal
with the occipital lobe.  The closer the first of these bridging gyri
lies to the longitudinal fissure, the shorter is the external
parieto-occipital fissure" (loc. cit. p. 12).

The obliteration of the external perpendicular fissure of Gratiolet,
therefore, is not a constant character of the human brain.  On the
other hand, its full development is not a constant character of the
higher ape's brain.  For, in the chimpanzee, the more or less extensive
obliteration of the external perpendicular sulcus by "bridging
convolutions," on one side or the other, has been noted over and over
again by Prof. Rolleston, Mr. Marshall, M. Broca and Professor Turner.
At the conclusion of a special paper on this subject the latter writes:
(72.  Notes more especially on the bridging convolutions in the Brain
of the Chimpanzee, 'Proceedings of the Royal Society of Edinburgh,'
1865-6.)

"The three specimens of the brain of a chimpanzee, just described,
prove, that the generalisation which Gratiolet has attempted to draw of
the complete absence of the first connecting convolution and the
concealment of the second, as essentially characteristic features in
the brain of this animal, is by no means universally applicable.  In
only one specimen did the brain, in these particulars, follow the law
which Gratiolet has expressed.  As regards the presence of the superior
bridging convolution, I am inclined to think that it has existed in one
hemisphere, at least, in a majority of the brains of this animal which
have, up to this time, been figured or described.  The superficial
position of the second bridging convolution is evidently less frequent,
and has as yet, I believe, only been seen in the brain (A) recorded in
this communication.  The asymmetrical arrangement in the convolutions
of the two hemispheres, which previous observers have referred to in
their descriptions, is also well illustrated in these specimens" (pp.
8, 9).

Even were the presence of the temporo-occipital, or external
perpendicular, sulcus, a mark of distinction between the higher apes
and man, the value of such a distinctive character would be rendered
very doubtful by the structure of the brain in the Platyrrhine apes.
In fact, while the temporo-occipital is one of the most constant of
sulci in the Catarrhine, or Old World, apes, it is never very strongly
developed in the New World apes; it is absent in the smaller
Platyrrhini; rudimentary in Pithecia (73. Flower, 'On the Anatomy of
Pithecia Monachus,' 'Proceedings of the Zoological Society,' 1862.);
and more or less obliterated by bridging convolutions in Ateles.

A character which is thus variable within the limits of a single group
can have no great taxonomic value.

It is further established, that the degree of asymmetry of the
convolution of the two sides in the human brain is subject to much
individual variation; and that, in those individuals of the Bushman
race who have been examined, the gyri and sulci of the two hemispheres
are considerably less complicated and more symmetrical than in the
European brain, while, in some individuals of the chimpanzee, their
complexity and asymmetry become notable.  This is particularly the case
in the brain of a young male chimpanzee figured by M. Broca.  ('L'ordre
des Primates,' p. 165, fig. 11.)

Again, as respects the question of absolute size, it is established
that the difference between the largest and the smallest healthy human
brain is greater than the difference between the smallest healthy human
brain and the largest chimpanzee's or orang's brain.

Moreover, there is one circumstance in which the orang's and
chimpanzee's brains resemble man's, but in which they differ from the
lower apes, and that is the presence of two corpora candicantia--the
Cynomorpha having but one.

In view of these facts I do not hesitate in this year 1874, to repeat
and insist upon the proposition which I enunciated in 1863:  (74.
'Man's Place in Nature,' p. 102.)

"So far as cerebral structure goes, therefore, it is clear that man
differs less from the chimpanzee or the orang, than these do even from
the monkeys, and that the difference between the brain of the
chimpanzee and of man is almost insignificant when compared with that
between the chimpanzee brain and that of a Lemur."

In the paper to which I have referred, Professor Bischoff does not deny
the second part of this statement, but he first makes the irrelevant
remark that it is not wonderful if the brains of an orang and a Lemur
are very different; and secondly, goes on to assert that, "If we
successively compare the brain of a man with that of an orang; the
brain of this with that of a chimpanzee; of this with that of a
gorilla, and so on of a Hylobates, Semnopithecus, Cynocephalus,
Cercopithecus, Macacus, Cebus, Callithrix, Lemur, Stenops, Hapale, we
shall not meet with a greater, or even as great a, break in the degree
of development of the convolutions, as we find between the brain of a
man and that of an orang or chimpanzee."

To which I reply, firstly, that whether this assertion be true or
false, it has nothing whatever to do with the proposition enunciated in
'Man's Place in Nature,' which refers not to the development of the
convolutions alone, but to the structure of the whole brain.  If
Professor Bischoff had taken the trouble to refer to p. 96 of the work
he criticises, in fact, he would have found the following passage:
"And it is a remarkable circumstance that though, so far as our present
knowledge extends, there IS one true structural break in the series of
forms of Simian brains, this hiatus does not lie between man and the
manlike apes, but between the lower and the lowest Simians, or in other
words, between the Old and New World apes and monkeys and the Lemurs.
Every Lemur which has yet been examined, in fact, has its cerebellum
partially visible from above; and its posterior lobe, with the
contained posterior cornu and hippocampus minor, more or less
rudimentary.  Every marmoset, American monkey, Old World monkey, baboon
or manlike ape, on the contrary, has its cerebellum entirely hidden,
posteriorly, by the cerebral lobes, and possesses a large posterior
cornu with a well-developed hippocampus minor."

This statement was a strictly accurate account of what was known when
it was made; and it does not appear to me to be more than apparently
weakened by the subsequent discovery of the relatively small
development of the posterior lobes in the Siamang and in the Howling
monkey.  Notwithstanding the exceptional brevity of the posterior lobes
in these two species, no one will pretend that their brains, in the
slightest degree, approach those of the Lemurs.  And if, instead of
putting Hapale out of its natural place, as Professor Bischoff most
unaccountably does, we write the series of animals he has chosen to
mention as follows:  Homo, Pithecus, Troglodytes, Hylobates,
Semnopithecus, Cynocephalus, Cercopithecus, Macacus, Cebus, Callithrix,
Hapale, Lemur, Stenops, I venture to reaffirm that the great break in
this series lies between Hapale and Lemur, and that this break is
considerably greater than that between any other two terms of that
series.  Professor Bischoff ignores the fact that long before he wrote,
Gratiolet had suggested the separation of the Lemurs from the other
Primates on the very ground of the difference in their cerebral
characters; and that Professor Flower had made the following
observations in the course of his description of the brain of the Javan
Loris:  (75.  'Transactions of the Zoological Society,' vol. v. 1862.)

"And it is especially remarkable that, in the development of the
posterior lobes, there is no approximation to the Lemurine, short
hemisphered brain, in those monkeys which are commonly supposed to
approach this family in other respects, viz. the lower members of the
Platyrrhine group."

So far as the structure of the adult brain is concerned, then, the very
considerable additions to our knowledge, which have been made by the
researches of so many investigators, during the past ten years, fully
justify the statement which I made in 1863.  But it has been said,
that, admitting the similarity between the adult brains of man and
apes, they are nevertheless, in reality, widely different, because they
exhibit fundamental differences in the mode of their development.  No
one would be more ready than I to admit the force of this argument, if
such fundamental differences of development really exist.  But I deny
that they do exist.  On the contrary, there is a fundamental agreement
in the development of the brain in men and apes.

Gratiolet originated the statement that there is a fundamental
difference in the development of the brains of apes and that of
man--consisting in this; that, in the apes, the sulci which first make
their appearance are situated on the posterior region of the cerebral
hemispheres, while, in the human foetus, the sulci first become visible
on the frontal lobes.  (76. "Chez tous les singes, les plis posterieurs
se developpent les premiers; les plis anterieurs se developpent plus
tard, aussi la vertebre occipitale et la parietale sont-elles
relativement tres-grandes chez le foetus.  L'Homme presente une
exception remarquable quant a l'epoque de l'apparition des plis
frontaux, qui sont les premiers indiques; mais le developpement general
du lobe frontal, envisage seulement par rapport a son volume, suit les
memes lois que dans les singes:"  Gratiolet, 'Memoire sur les plis
cerebres de l'Homme et des Primateaux,' p. 39, Tab. iv, fig. 3.)

This general statement is based upon two observations, the one of a
Gibbon almost ready to be born, in which the posterior gyri were "well
developed," while those of the frontal lobes were "hardly indicated"
(77.  Gratiolet's words are (loc. cit. p. 39): "Dans le foetus dont il
s'agit les plis cerebraux posterieurs sont bien developpes, tandis que
les plis du lobe frontal sont a peine indiques."  The figure, however
(Pl. iv, fig. 3), shews the fissure of Rolando, and one of the frontal
sulci plainly enough. Nevertheless, M. Alix, in his 'Notice sur les
travaux anthropologiques de Gratiolet' ('Mem. de la Societe
d'Anthropologie de Paris,' 1868, page 32), writes thus: "Gratiolet a eu
entre les mains le cerveau d'un foetus de Gibbon, singe eminemment
superieur, et tellement rapproche de l'orang, que des naturalistes
tres-competents l'ont range parmi les anthropoides.  M. Huxley, par
exemple, n'hesite pas sur ce point. Eh bien, c'est sur le cerveau d'un
foetus de Gibbon que Gratiolet a vu LES CIRCONVOLUTIONS DU LOBE
TEMPORO-SPHENOIDAL DEJA DEVELOPPEES LORSQU'IL N'EXISTENT PAS ENCORE DE
PLIS SUR LE LOBE FRONTAL.  Il etait donc bien autorise a dire que, chez
l'homme les circonvolutions apparaissent d'a en w, tandis que chez les
singes elles se developpent d'w en a."), and the other of a human
foetus at the 22nd or 23rd week of uterogestation, in which Gratiolet
notes that the insula was uncovered, but that nevertheless "des
incisures sement de lobe anterieur, une scissure peu profonde indique
la separation du lobe occipital, tres-reduit, d'ailleurs des cette
epoque.  Le reste de la surface cerebrale est encore absolument lisse."

Three views of this brain are given in Plate II, figs. 1, 2, 3, of the
work cited, shewing the upper, lateral and inferior views of the
hemispheres, but not the inner view.  It is worthy of note that the
figure by no means bears out Gratiolet's description, inasmuch as the
fissure (antero-temporal) on the posterior half of the face of the
hemisphere is more marked than any of those vaguely indicated in the
anterior half.  If the figure is correct, it in no way justifies
Gratiolet's conclusion:  "Il y a donc entre ces cerveaux [those of a
Callithrix and of a Gibbon] et celui du foetus humain une difference
fondamental.  Chez celui-ci, longtemps avant que les plis temporaux
apparaissent, les plis frontaux, ESSAYENT d'exister."

Since Gratiolet's time, however, the development of the gyri and sulci
of the brain has been made the subject of renewed investigation by
Schmidt, Bischoff, Pansch (78.  'Ueber die typische Anordnung der
Furchen und Windungen auf den Grosshirn-Hemispharen des Menschen und
der Affen,' 'Archiv fur Anthropologie,' iii. 1868.), and more
particularly by Ecker (79. 'Zur Entwicklungs Geschichte der Furchen und
Windungen der Grosshirn-Hemispharen im Foetus des Menschen.'  'Archiv
fur Anthropologie,' iii. 1868.), whose work is not only the latest, but
by far the most complete, memoir on the subject.

The final results of their inquiries may be summed up as follows:--

1.  In the human foetus, the sylvian fissure is formed in the course of
the third month of uterogestation.  In this, and in the fourth month,
the cerebral hemispheres are smooth and rounded (with the exception of
the sylvian depression), and they project backwards far beyond the
cerebellum.

2.  The sulci, properly so called, begin to appear in the interval
between the end of the fourth and the beginning of the sixth month of
foetal life, but Ecker is careful to point out that, not only the time,
but the order, of their appearance is subject to considerable
individual variation.  In no case, however, are either the frontal or
the temporal sulci the earliest.

The first which appears, in fact, lies on the inner face of the
hemisphere (whence doubtless Gratiolet, who does not seem to have
examined that face in his foetus, overlooked it), and is either the
internal perpendicular (occipito-parietal), or the calcarine sulcus,
these two being close together and eventually running into one another.
As a rule the occipito-parietal is the earlier of the two.

3.  At the latter part of this period, another sulcus, the
"posterio-parietal," or "Fissure of Rolando" is developed, and it is
followed, in the course of the sixth month, by the other principal
sulci of the frontal, parietal, temporal and occipital lobes.  There
is, however, no clear evidence that one of these constantly appears
before the other; and it is remarkable that, in the brain at the period
described and figured by Ecker (loc. cit. pp. 212-213, Taf. II, figs.
1, 2, 3, 4), the antero-temporal sulcus (scissure parallele) so
characteristic of the ape's brain, is as well, if not better developed
than the fissure of Rolando, and is much more marked than the proper
frontal sulci.

Taking the facts as they now stand, it appears to me that the order of
the appearance of the sulci and gyri in the foetal human brain is in
perfect harmony with the general doctrine of evolution, and with the
view that man has been evolved from some ape-like form; though there
can be no doubt that form was, in many respects, different from any
member of the Primates now living.

Von Baer taught us, half a century ago, that, in the course of their
development, allied animals put on at first, the characters of the
greater groups to which they belong, and, by degrees, assume those
which restrict them within the limits of their family, genus, and
species; and he proved, at the same time, that no developmental stage
of a higher animal is precisely similar to the adult condition of any
lower animal.  It is quite correct to say that a frog passes through
the condition of a fish, inasmuch as at one period of its life the
tadpole has all the characters of a fish, and if it went no further,
would have to be grouped among fishes.  But it is equally true that a
tadpole is very different from any known fish.

In like manner, the brain of a human foetus, at the fifth month, may
correctly be said to be, not only the brain of an ape, but that of an
Arctopithecine or marmoset-like ape; for its hemispheres, with their
great posterior lobster, and with no sulci but the sylvian and the
calcarine, present the characteristics found only in the group of the
Arctopithecine Primates.  But it is equally true, as Gratiolet remarks,
that, in its widely open sylvian fissure, it differs from the brain of
any actual marmoset.  No doubt it would be much more similar to the
brain of an advanced foetus of a marmoset.  But we know nothing
whatever of the development of the brain in the marmosets.  In the
Platyrrhini proper, the only observation with which I am acquainted is
due to Pansch, who found in the brain of a foetal Cebus Apella, in
addition to the sylvian fissure and the deep calcarine fissure, only a
very shallow antero-temporal fissure (scissure parallele of Gratiolet).

Now this fact, taken together with the circumstance that the
antero-temporal sulcus is present in such Platyrrhini as the Saimiri,
which present mere traces of sulci on the anterior half of the exterior
of the cerebral hemispheres, or none at all, undoubtedly, so far as it
goes, affords fair evidence in favour of Gratiolet's hypothesis, that
the posterior sulci appear before the anterior, in the brains of the
Platyrrhini.  But, it by no means follows, that the rule which may hold
good for the Platyrrhini extends to the Catarrhini.  We have no
information whatever respecting the development of the brain in the
Cynomorpha; and, as regards the Anthropomorpha, nothing but the account
of the brain of the Gibbon, near birth, already referred to.  At the
present moment there is not a shadow of evidence to shew that the sulci
of a chimpanzee's, or orang's, brain do not appear in the same order as
a man's.

Gratiolet opens his preface with the aphorism:  "Il est dangereux dans
les sciences de conclure trop vite."  I fear he must have forgotten
this sound maxim by the time he had reached the discussion of the
differences between men and apes, in the body of his work.  No doubt,
the excellent author of one of the most remarkable contributions to the
just understanding of the mammalian brain which has ever been made,
would have been the first to admit the insufficiency of his data had he
lived to profit by the advance of inquiry.  The misfortune is that his
conclusions have been employed by persons incompetent to appreciate
their foundation, as arguments in favour of obscurantism.  (80.  For
example, M. l'Abbe Lecomte in his terrible pamphlet, 'Le Darwinisme et
l'origine de l'Homme,' 1873.)

But it is important to remark that, whether Gratiolet was right or
wrong in his hypothesis respecting the relative order of appearance of
the temporal and frontal sulci, the fact remains; that before either
temporal or frontal sulci, appear, the foetal brain of man presents
characters which are found only in the lowest group of the Primates
(leaving out the Lemurs); and that this is exactly what we should
expect to be the case, if man has resulted from the gradual
modification of the same form as that from which the other Primates
have sprung.










End of the Project Gutenberg EBook of Note on the Resemblances and
Differences in the Structure and the Development of Brain in Man and the Apes, by Thomas Henry Huxley

*** END OF THIS PROJECT GUTENBERG EBOOK RESEMBLANCES-DIFFERENCES OF BRAIN ***

***** This file should be named 2354.txt or 2354.zip *****
This and all associated files of various formats will be found in:
        http://www.gutenberg.org/2/3/5/2354/

Produced by Sue Asscher.  HTML version by Al Haines.

Updated editions will replace the previous one--the old editions
will be renamed.

Creating the works from public domain print editions means that no
one owns a United States copyright in these works, so the Foundation
(and you!) can copy and distribute it in the United States without
permission and without paying copyright royalties.  Special rules,
set forth in the General Terms of Use part of this license, apply to
copying and distributing Project Gutenberg-tm electronic works to
protect the PROJECT GUTENBERG-tm concept and trademark.  Project
Gutenberg is a registered trademark, and may not be used if you
charge for the eBooks, unless you receive specific permission.  If you
do not charge anything for copies of this eBook, complying with the
rules is very easy.  You may use this eBook for nearly any purpose
such as creation of derivative works, reports, performances and
research.  They may be modified and printed and given away--you may do
practically ANYTHING with public domain eBooks.  Redistribution is
subject to the trademark license, especially commercial
redistribution.



*** START: FULL LICENSE ***

THE FULL PROJECT GUTENBERG LICENSE
PLEASE READ THIS BEFORE YOU DISTRIBUTE OR USE THIS WORK

To protect the Project Gutenberg-tm mission of promoting the free
distribution of electronic works, by using or distributing this work
(or any other work associated in any way with the phrase "Project
Gutenberg"), you agree to comply with all the terms of the Full Project
Gutenberg-tm License (available with this file or online at
http://gutenberg.net/license).


Section 1.  General Terms of Use and Redistributing Project Gutenberg-tm
electronic works

1.A.  By reading or using any part of this Project Gutenberg-tm
electronic work, you indicate that you have read, understand, agree to
and accept all the terms of this license and intellectual property
(trademark/copyright) agreement.  If you do not agree to abide by all
the terms of this agreement, you must cease using and return or destroy
all copies of Project Gutenberg-tm electronic works in your possession.
If you paid a fee for obtaining a copy of or access to a Project
Gutenberg-tm electronic work and you do not agree to be bound by the
terms of this agreement, you may obtain a refund from the person or
entity to whom you paid the fee as set forth in paragraph 1.E.8.

1.B.  "Project Gutenberg" is a registered trademark.  It may only be
used on or associated in any way with an electronic work by people who
agree to be bound by the terms of this agreement.  There are a few
things that you can do with most Project Gutenberg-tm electronic works
even without complying with the full terms of this agreement.  See
paragraph 1.C below.  There are a lot of things you can do with Project
Gutenberg-tm electronic works if you follow the terms of this agreement
and help preserve free future access to Project Gutenberg-tm electronic
works.  See paragraph 1.E below.

1.C.  The Project Gutenberg Literary Archive Foundation ("the Foundation"
or PGLAF), owns a compilation copyright in the collection of Project
Gutenberg-tm electronic works.  Nearly all the individual works in the
collection are in the public domain in the United States.  If an
individual work is in the public domain in the United States and you are
located in the United States, we do not claim a right to prevent you from
copying, distributing, performing, displaying or creating derivative
works based on the work as long as all references to Project Gutenberg
are removed.  Of course, we hope that you will support the Project
Gutenberg-tm mission of promoting free access to electronic works by
freely sharing Project Gutenberg-tm works in compliance with the terms of
this agreement for keeping the Project Gutenberg-tm name associated with
the work.  You can easily comply with the terms of this agreement by
keeping this work in the same format with its attached full Project
Gutenberg-tm License when you share it without charge with others.

1.D.  The copyright laws of the place where you are located also govern
what you can do with this work.  Copyright laws in most countries are in
a constant state of change.  If you are outside the United States, check
the laws of your country in addition to the terms of this agreement
before downloading, copying, displaying, performing, distributing or
creating derivative works based on this work or any other Project
Gutenberg-tm work.  The Foundation makes no representations concerning
the copyright status of any work in any country outside the United
States.

1.E.  Unless you have removed all references to Project Gutenberg:

1.E.1.  The following sentence, with active links to, or other immediate
access to, the full Project Gutenberg-tm License must appear prominently
whenever any copy of a Project Gutenberg-tm work (any work on which the
phrase "Project Gutenberg" appears, or with which the phrase "Project
Gutenberg" is associated) is accessed, displayed, performed, viewed,
copied or distributed:

This eBook is for the use of anyone anywhere at no cost and with
almost no restrictions whatsoever.  You may copy it, give it away or
re-use it under the terms of the Project Gutenberg License included
with this eBook or online at www.gutenberg.net

1.E.2.  If an individual Project Gutenberg-tm electronic work is derived
from the public domain (does not contain a notice indicating that it is
posted with permission of the copyright holder), the work can be copied
and distributed to anyone in the United States without paying any fees
or charges.  If you are redistributing or providing access to a work
with the phrase "Project Gutenberg" associated with or appearing on the
work, you must comply either with the requirements of paragraphs 1.E.1
through 1.E.7 or obtain permission for the use of the work and the
Project Gutenberg-tm trademark as set forth in paragraphs 1.E.8 or
1.E.9.

1.E.3.  If an individual Project Gutenberg-tm electronic work is posted
with the permission of the copyright holder, your use and distribution
must comply with both paragraphs 1.E.1 through 1.E.7 and any additional
terms imposed by the copyright holder.  Additional terms will be linked
to the Project Gutenberg-tm License for all works posted with the
permission of the copyright holder found at the beginning of this work.

1.E.4.  Do not unlink or detach or remove the full Project Gutenberg-tm
License terms from this work, or any files containing a part of this
work or any other work associated with Project Gutenberg-tm.

1.E.5.  Do not copy, display, perform, distribute or redistribute this
electronic work, or any part of this electronic work, without
prominently displaying the sentence set forth in paragraph 1.E.1 with
active links or immediate access to the full terms of the Project
Gutenberg-tm License.

1.E.6.  You may convert to and distribute this work in any binary,
compressed, marked up, nonproprietary or proprietary form, including any
word processing or hypertext form.  However, if you provide access to or
distribute copies of a Project Gutenberg-tm work in a format other than
"Plain Vanilla ASCII" or other format used in the official version
posted on the official Project Gutenberg-tm web site (www.gutenberg.net),
you must, at no additional cost, fee or expense to the user, provide a
copy, a means of exporting a copy, or a means of obtaining a copy upon
request, of the work in its original "Plain Vanilla ASCII" or other
form.  Any alternate format must include the full Project Gutenberg-tm
License as specified in paragraph 1.E.1.

1.E.7.  Do not charge a fee for access to, viewing, displaying,
performing, copying or distributing any Project Gutenberg-tm works
unless you comply with paragraph 1.E.8 or 1.E.9.

1.E.8.  You may charge a reasonable fee for copies of or providing
access to or distributing Project Gutenberg-tm electronic works provided
that

- You pay a royalty fee of 20% of the gross profits you derive from
     the use of Project Gutenberg-tm works calculated using the method
     you already use to calculate your applicable taxes.  The fee is
     owed to the owner of the Project Gutenberg-tm trademark, but he
     has agreed to donate royalties under this paragraph to the
     Project Gutenberg Literary Archive Foundation.  Royalty payments
     must be paid within 60 days following each date on which you
     prepare (or are legally required to prepare) your periodic tax
     returns.  Royalty payments should be clearly marked as such and
     sent to the Project Gutenberg Literary Archive Foundation at the
     address specified in Section 4, "Information about donations to
     the Project Gutenberg Literary Archive Foundation."

- You provide a full refund of any money paid by a user who notifies
     you in writing (or by e-mail) within 30 days of receipt that s/he
     does not agree to the terms of the full Project Gutenberg-tm
     License.  You must require such a user to return or
     destroy all copies of the works possessed in a physical medium
     and discontinue all use of and all access to other copies of
     Project Gutenberg-tm works.

- You provide, in accordance with paragraph 1.F.3, a full refund of any
     money paid for a work or a replacement copy, if a defect in the
     electronic work is discovered and reported to you within 90 days
     of receipt of the work.

- You comply with all other terms of this agreement for free
     distribution of Project Gutenberg-tm works.

1.E.9.  If you wish to charge a fee or distribute a Project Gutenberg-tm
electronic work or group of works on different terms than are set
forth in this agreement, you must obtain permission in writing from
both the Project Gutenberg Literary Archive Foundation and Michael
Hart, the owner of the Project Gutenberg-tm trademark.  Contact the
Foundation as set forth in Section 3 below.

1.F.

1.F.1.  Project Gutenberg volunteers and employees expend considerable
effort to identify, do copyright research on, transcribe and proofread
public domain works in creating the Project Gutenberg-tm
collection.  Despite these efforts, Project Gutenberg-tm electronic
works, and the medium on which they may be stored, may contain
"Defects," such as, but not limited to, incomplete, inaccurate or
corrupt data, transcription errors, a copyright or other intellectual
property infringement, a defective or damaged disk or other medium, a
computer virus, or computer codes that damage or cannot be read by
your equipment.

1.F.2.  LIMITED WARRANTY, DISCLAIMER OF DAMAGES - Except for the "Right
of Replacement or Refund" described in paragraph 1.F.3, the Project
Gutenberg Literary Archive Foundation, the owner of the Project
Gutenberg-tm trademark, and any other party distributing a Project
Gutenberg-tm electronic work under this agreement, disclaim all
liability to you for damages, costs and expenses, including legal
fees.  YOU AGREE THAT YOU HAVE NO REMEDIES FOR NEGLIGENCE, STRICT
LIABILITY, BREACH OF WARRANTY OR BREACH OF CONTRACT EXCEPT THOSE
PROVIDED IN PARAGRAPH F3.  YOU AGREE THAT THE FOUNDATION, THE
TRADEMARK OWNER, AND ANY DISTRIBUTOR UNDER THIS AGREEMENT WILL NOT BE
LIABLE TO YOU FOR ACTUAL, DIRECT, INDIRECT, CONSEQUENTIAL, PUNITIVE OR
INCIDENTAL DAMAGES EVEN IF YOU GIVE NOTICE OF THE POSSIBILITY OF SUCH
DAMAGE.

1.F.3.  LIMITED RIGHT OF REPLACEMENT OR REFUND - If you discover a
defect in this electronic work within 90 days of receiving it, you can
receive a refund of the money (if any) you paid for it by sending a
written explanation to the person you received the work from.  If you
received the work on a physical medium, you must return the medium with
your written explanation.  The person or entity that provided you with
the defective work may elect to provide a replacement copy in lieu of a
refund.  If you received the work electronically, the person or entity
providing it to you may choose to give you a second opportunity to
receive the work electronically in lieu of a refund.  If the second copy
is also defective, you may demand a refund in writing without further
opportunities to fix the problem.

1.F.4.  Except for the limited right of replacement or refund set forth
in paragraph 1.F.3, this work is provided to you 'AS-IS' WITH NO OTHER
WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
WARRANTIES OF MERCHANTIBILITY OR FITNESS FOR ANY PURPOSE.

1.F.5.  Some states do not allow disclaimers of certain implied
warranties or the exclusion or limitation of certain types of damages.
If any disclaimer or limitation set forth in this agreement violates the
law of the state applicable to this agreement, the agreement shall be
interpreted to make the maximum disclaimer or limitation permitted by
the applicable state law.  The invalidity or unenforceability of any
provision of this agreement shall not void the remaining provisions.

1.F.6.  INDEMNITY - You agree to indemnify and hold the Foundation, the
trademark owner, any agent or employee of the Foundation, anyone
providing copies of Project Gutenberg-tm electronic works in accordance
with this agreement, and any volunteers associated with the production,
promotion and distribution of Project Gutenberg-tm electronic works,
harmless from all liability, costs and expenses, including legal fees,
that arise directly or indirectly from any of the following which you do
or cause to occur: (a) distribution of this or any Project Gutenberg-tm
work, (b) alteration, modification, or additions or deletions to any
Project Gutenberg-tm work, and (c) any Defect you cause.


Section  2.  Information about the Mission of Project Gutenberg-tm

Project Gutenberg-tm is synonymous with the free distribution of
electronic works in formats readable by the widest variety of computers
including obsolete, old, middle-aged and new computers.  It exists
because of the efforts of hundreds of volunteers and donations from
people in all walks of life.

Volunteers and financial support to provide volunteers with the
assistance they need, is critical to reaching Project Gutenberg-tm's
goals and ensuring that the Project Gutenberg-tm collection will
remain freely available for generations to come.  In 2001, the Project
Gutenberg Literary Archive Foundation was created to provide a secure
and permanent future for Project Gutenberg-tm and future generations.
To learn more about the Project Gutenberg Literary Archive Foundation
and how your efforts and donations can help, see Sections 3 and 4
and the Foundation web page at http://www.pglaf.org.


Section 3.  Information about the Project Gutenberg Literary Archive
Foundation

The Project Gutenberg Literary Archive Foundation is a non profit
501(c)(3) educational corporation organized under the laws of the
state of Mississippi and granted tax exempt status by the Internal
Revenue Service.  The Foundation's EIN or federal tax identification
number is 64-6221541.  Its 501(c)(3) letter is posted at
http://pglaf.org/fundraising.  Contributions to the Project Gutenberg
Literary Archive Foundation are tax deductible to the full extent
permitted by U.S. federal laws and your state's laws.

The Foundation's principal office is located at 4557 Melan Dr. S.
Fairbanks, AK, 99712., but its volunteers and employees are scattered
throughout numerous locations.  Its business office is located at
809 North 1500 West, Salt Lake City, UT 84116, (801) 596-1887, email
business@pglaf.org.  Email contact links and up to date contact
information can be found at the Foundation's web site and official
page at http://pglaf.org

For additional contact information:
     Dr. Gregory B. Newby
     Chief Executive and Director
     gbnewby@pglaf.org


Section 4.  Information about Donations to the Project Gutenberg
Literary Archive Foundation

Project Gutenberg-tm depends upon and cannot survive without wide
spread public support and donations to carry out its mission of
increasing the number of public domain and licensed works that can be
freely distributed in machine readable form accessible by the widest
array of equipment including outdated equipment.  Many small donations
($1 to $5,000) are particularly important to maintaining tax exempt
status with the IRS.

The Foundation is committed to complying with the laws regulating
charities and charitable donations in all 50 states of the United
States.  Compliance requirements are not uniform and it takes a
considerable effort, much paperwork and many fees to meet and keep up
with these requirements.  We do not solicit donations in locations
where we have not received written confirmation of compliance.  To
SEND DONATIONS or determine the status of compliance for any
particular state visit http://pglaf.org

While we cannot and do not solicit contributions from states where we
have not met the solicitation requirements, we know of no prohibition
against accepting unsolicited donations from donors in such states who
approach us with offers to donate.

International donations are gratefully accepted, but we cannot make
any statements concerning tax treatment of donations received from
outside the United States.  U.S. laws alone swamp our small staff.

Please check the Project Gutenberg Web pages for current donation
methods and addresses.  Donations are accepted in a number of other
ways including including checks, online payments and credit card
donations.  To donate, please visit: http://pglaf.org/donate


Section 5.  General Information About Project Gutenberg-tm electronic
works.

Professor Michael S. Hart is the originator of the Project Gutenberg-tm
concept of a library of electronic works that could be freely shared
with anyone.  For thirty years, he produced and distributed Project
Gutenberg-tm eBooks with only a loose network of volunteer support.


Project Gutenberg-tm eBooks are often created from several printed
editions, all of which are confirmed as Public Domain in the U.S.
unless a copyright notice is included.  Thus, we do not necessarily
keep eBooks in compliance with any particular paper edition.


Most people start at our Web site which has the main PG search facility:

     http://www.gutenberg.net

This Web site includes information about Project Gutenberg-tm,
including how to make donations to the Project Gutenberg Literary
Archive Foundation, how to help produce our new eBooks, and how to
subscribe to our email newsletter to hear about new eBooks.