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Cloth bds. 18s *»* In ordering this book, the edition published by Winn1ams and Nor- Gate and Nurr should be particularly specified, as a reprint of an old Edition (1773), in every respect inferior, has been recently produced, a en ee ee TR ern aeons ae eee eh ae, ig 44 ae Cte tate EVIDENCE AS TO MAN’S PLACE IN NATURE. ‘suoabung fo abayjog ywohoay ayn fo wnasnyy oy, Ue suamrods wouf suryunpy asnoysanmy “aye Aq Uap ‘(aungou Sp aban] 8D 29102 sn YoryUs Uoggry ayz fo 104] ededx—a) azrs younqou ayy fo suniborgT Wout poonpas hyynavydouboj0y “‘VITINON) ‘LAZNVAWIHD) ‘NOMALd) ayn fo suojnayy EVIDENCE AS TO MANS PLACE IN NATURE. BY THOMAS HENRY HUXLEY, FELLOW OF THE ROYAL SOCIETY. WILLIAMS AND NORGATE, 14, HENRIETTA STREET, COVENT GARDEN, LONDON ; AND 20, SOUTH FREDERICK STREET, EDINBURGH. 1868. Lid @00¥Y WALYSA1 es a Sire Sell th of an inch in diameter. It contains a mass of viscid nutritive matter—the ‘yelk’ —within which is inclosed a second much more delicate spheroidal bag, called the ‘germinal vesicle’ (a). un this, lastly, hes a more solid rounded. body, termed the ‘ germinal spot ? (db). Fie, 13.—A. Egg of the Dog, with the vitelline membrane burst, so as to give exit to the yelk, the germinal vesicle (a), and its included spot (0). B.C.D.E.F. Successive changes of the yelk indicated in the text. After Bischoff. The egg, or ‘Ovum,’ is originally formed within a gland, from which, in due season, it becomes detached, and passes ‘into the living chamber fitted for its protection and main- tenance during the protracted process of gestation. Here, wa nell says, 62 when subjected to the required conditions, this minute and apparently insignificant particle of living matter, becomes animated by a new and mysterious activity. The germinal vesicle and spot cease to be discernible (their precise fate being one of the yet unsolved problems of embryology), but the yelk becomes circumferentially indented, as if an in- visible knife had been drawn round it, and thus appears divided into two hemispheres (Fig. 13, C). By the repetition of this process in various planes, these hemispheres become subdivided, so that four segments are produced (D) ; and these, in like manner, divide and subdivide again, until the whole yelk is converted into a mass of granules, each of which consists of a minute spheroid of yelk-substance, inclosing @ central particle, the so-called ‘nucleus’ (F). Nature, by this process, has attained much the same result as that at which a human artificer arrives by his operations in a brick field. She takes the rough plastic ma- terial of the yelk and breaks it up into well-shaped tolerably eyen-sized masses—handy for building up into any part of the living edifice. Next, the mass of organic bricks, or ‘cells’ as they are technically called, thus formed, acquires an orderly arrange- ment, becoming converted into a hollow spheroid with double walls, Then, upon one side of this spheroid, appears a thickening, and, by and bye, in the centre of the area of thickening, a straight shallow groove (Fig. 14, A) marks the central line of the edifice which is to be raised, or, in other words, indicates the position of the middle line of the body of the future dog. The substance bounding the groove on each side next rises up into a fold, the rudiment of the side wall of that long cavity, which will eventually lodge the spinal marrow and the brain; and in the floor of this chamber ap- pears a solid cellular cord, the so-called ‘notochord? One end of the inclosed cavity dilates to form the head (Fig.14, B), the other remains ‘narrow, and eventually becomes the tail ; the side walls of the body are fashioned out of the downward 63 continuation of the walls of the groove; and from them, by and bye, grow out little buds which, by degrees, assume the shape of limbs. Watching the fashioning process stage by stage, one is forcibly reminded of the modeller in clay. Every part, every organ, is at first, as it were, pinched up rudely, and sketched out in the rough; then shaped more accurately; and only, at last, receives the touches which stamp its final character. Thus, at length, the young puppy assumes such a form as is shewn in Fig. 14, C. In this condition it has a dispro- Ne e——EEe Fre. 14.—A. Earliest rudiment of the Dog. B. Rudiment further advanced, showing the foundations of the head, tail, and vertebral column. -C. The very young puppy, with attached ends of the yelk-sac and allantois, and invested in the amnion. bud-like limbs are unlike his legs. The remains of the yelk, which have not yet been applied to the nutrition and growth of the young animal, are con- . tained in a sac attached to the rudimentary intestine, and termed the yelk sac, or ‘umbilical vesicle.” Two membranous | bags, intended to subserve respectively the protection and nutrition of the young creature, have been developed from the skin and from the under and hinder surface of the body ; portionately large head, as dissimilar to that of a dog as the 64 the former, the so-called ‘ amnion, is a sac filled with fluid, which invests the whole body of the embryo, and plays the part of a sort of water-bed for it; the other, termed the ‘allantois,’ grows out, loaded with blood-vessels, from the ventral region, and eventually applying itself to the walls of the cavity, in which the developing organism is contained, enables these vessels to become the channel by which the stream of nutriment, required to supply the wants of the off- spring, is furnished to it by the parent. The structure which is developed by the interlacement of the vessels of the offspring with those of the parent, and by means of which the former is enabled to receive nourishment and to get rid of effete matters, is termed the ‘ Placenta,’ It would be tedious, and it is unnecessary for my present purpose, to trace the process of development further; suffice it to say, that, by a long and gradual series of changes, the rudiment here depicted and described, becomes a puppy, is born, and then, by still slower and less perceptible steps, passes into the adult Dog. There is not much apparent resemblance between a barn- door Fowl and the Dog who protects the farm-yard. Never- theless the student of development finds, not only that the chick commences its existence as an egg, primarily identical, in all essential respects, with that of the Dog, but that the yelk of this egg undergoes division—that the primitive groove arises, and that the contiguous parts of the germ are fashioned, by precisely similar methods, into a young chick, which, at one stage of its existence, is so like the nascent Dog, that ordinary inspection would hardly distinguish the two. The history of the development of any other vertebrate animal, Lizard, Snake, Frog, or Fish, tells the same story. There’ is always, to begin with, an egg having the same essen- tial structure as that of the Dog :—the yelk of that egg always undergoes division, or ‘segmentation’ as it is often called: the ultimate products of that segmentation constitute the building Se ee lat apis B MELO LUI IKE 65 materials for the body of the young animal; and this is built up round a primitive groove, in the floor of which a notochord is developed. Furthermore, there is a period in which the young of all these animals resemble one another, not merely in outward form, but in all essentials of structure, so closely, that the differences between them are inconsiderable, while, in their subsequent course, they diverge more and more widely from one another. And it is a general law, that, the more closely any animals resemble one another in adult structure, the longer and the more intimately do their embryos resemble one another: so that, for example, the embryos of a Snake and of a Lizard remain like one another longer than do those of a Snake and of a Bird; and the embryo of a Dog and of a Cat remain like one another for a far longer period than do those of a Dog and a Bird; or of a Dog and an Opossum; or even than those of a Dog and a Monkey. — Thus the study of development affords a clear test of close- ness of structural affinity, and one turns with impatience to inquire what results are yielded by the study of the develop- ment of Man. Is he something apart? Does he originate in a totally different way from Dog, Bird, Frog, and Fish, thus justifying those who assert him to have no place in nature and no real affinity with the lower world of animal life? Or does he originate in a similar germ, pass through the same slow and gradually progressive modifications,—depend on the same contrivances for protection and nutrition, and finally enter the world by the help of the same mechanism? The reply is not doubtful for a moment, and has not been doubtful any time these thirty years. Without question, the mode of origin and the early stages of the development of man are identical with those of the animals immediately: below him in the scale :—without a doubt, in these respects, he is far nearer the Apes, than the Apes are to the Dog. The Human ovum is about ;4, of an inch in diameter, and © might be described in the same terms as that of the Dog, so that I need only refer to the figure illustrative (15 A.) of its F ‘ e en ECR: ES a a +3. eae A MOE cA Pe: 66 structure. It leaves the organ in which it is formed in a simi- lar fashion and enters the organic chamber prepared for its reception in the same way, the conditions of its development being in all respects the same. It has not yet been possible (and only by some rare chance can it ever be possible) to study the human ovum in so early a‘developmental stage as that of yelk division, but there is every reason to conclude that the changes it undergoes are identical with those ex- hibited by the ova of other vertebrated animals; for the formative materials of which the rudimentary human body is composed, in the earliest conditions in which it has been observed. are the same as those of other animals. Some of these earliest stages are figured below and,as will be seen, they are strictly comparable to the very early states of the Dog; the marvellous correspondence between the two which is kept up, even for some time, as development advances, becoming apparent by the simple comparison of the figures with those on page 63. Fre. 15.—A. Human ovum (after Kolliker). a. germinal vesicle. 6. germinal spot. P aed B. A very early condition of Man, with yelk-sac, allantois and amnion (original). ©. A more advanced stage (after Kolliker), compare fig. 14, C. Indeed, it is very long before the body of the young human being can be readily discriminated from that of the young ie ——— ae eee 67 puppy; but, at a tolerably early period, the two become dis- tinguishable by the different form of their adjuncts, the yelk- sac and the allantois. The former, in the Dog, becomes long and spindle-shaped, while in Man it remains spherical: the latter, in the Dog, attains an extremely large size, and the vascular processes which are developed from it and eventually give rise to the formation of the placenta (taking root, as it were, in the parental organism, so as to draw nourishment therefrom, as the root of a tree extracts it from the soil) are arranged in an encircling zone, while in Man, the allantois remains comparatively small, and its vascular rootlets are eventually restricted to one disk-like spot. Hence, while the placenta of the Dog is like a girdle, that of Man has the cake-like form, indicated by the name of the organ. But, exactly in those respects in which the developing Man differs from the Dog, he resembles the ape, which, like man, has a spheroidal yelk-sac and a discoidal—sometimes par- tially lobed-placenta. | So that it is only quite in the later stages of development ° that the young human being presents marked differences from the young .ape, while the latter departs as much from the dog in its development, as the man does. . Startling as the last assertion may appear to be, it is de- monustrably true, and it alone appears to me sufficient to place beyond all doubt the structural unity of man with the rest of the animal world, and more particularly and closely with the apes. Thus, identical in the physical processes by which he ori- nates—identical in the early stages of his formation—identical in the mode of his nutrition before and after birth, with the animals which lie immediately below him in the scale—Man, if his adult and perfect structure be compared with theirs, exhibits, as might he expected, a marvellous likeness of organization. He resembles them as they resemble one another—he differs from them as they differ from one F2 ans lea iN LS late 68 another.—And, though these differences and resemblances cannot be weighed and measured, their value may be readily estimated ; the scale or standard of judgment, touching that value, being afforded and expressed by the system of classi- fication of animals now current among zoologists. A careful study of the resemblances and differences pre- sented by animals has, in fact, led naturalists to arrange them into groups, or assemblages, all the members of each group presenting a certain amount of definable resemblance, and the number of points of similarity being smaller as the group is larger and vicé versd. Thus, all creatures which agree only in presenting the few distinctive marks of ani- mality form the ‘Kingdom’ Antmatia. The numerous animals which agree only in possessing the special characters of Vertebrates form one ‘Sub-kingdom’ of this Kingdom. Then the Sub-kingdom Verrrsrara is subdivided into the five ‘Classes,’ Fishes, Amphibians, Reptiles, Birds, and Mammals, and these into smaller groups called ‘Orders;’ these into ‘Families’ and ‘ Genera ;’ while the last are finally broken up into the smallest assemblages, which are distinguished by the possession of constant, not-sexual, characters. These ultimate groups are Species. Every year tends to bring about a greater uniformity of opinion throughout the zoological world as to the limits and characters of these groups, great and small. At present, for example, no one has the least doubt regarding the characters of the classes Mammalia, Aves, or Reptilia; nor does the question arise whether any thoroughly well-known animal should be placed in one class or the other. Again, there is avery general agreement respecting the characters and limits of the orders of Mammals, and as to the animals which are structurally necessitated to take a place in one or another order. No one doubts, for example, that the Sloth and the Ant- eater, the Kangaroo and the Opossum, the Tiger and the Badger, the Tapir and the Rhinoceros, are respectively mem- 69 bers of the same orders. These successive pairs of animals may, and some do, differ from one another immensely, in such matters as the proportions and structure of their limbs; the number of their dorsal and lumbar vertebre; the adap- tation of their frames to climbing, leaping, or running; the number and form of their teeth; and the characters of their skulls and of the contained brain. But, with all these dif- ferences, they are so closely connected in all the more im- portant and fundamental characters of their organization, and so distinctly separated by these same characters from other animals, that zoologists find it necessary to group them to- gether as members of one order. And if any new animal were discovered, and were found to present no greater dif- ference from the Kangaroo and the Opossum, for example, than these animals do from one another, the zoologist would not only be logically compelled to rank it in the same order with these, but he would not think of doing otherwise. Bearing this obvious course of zoological reasoning in mind, let us endeavour for a moment to disconnect our thinking selves from the mask of humanity; let us imagine ourselves scientific Saturnians, if you will, fairly acquainted _ with such animals. as now inhabit the Earth, and employed in discussing the relations they bear to a new and singular ‘ erect and featherless biped,’ which some enterprising traveller, overcoming the difficulties of space and gravitation, has brought from that distant planet for our inspection, well pre- served, may be, in acask of rum. We should all, at once, agree upon placing him among the mammalian vertebrates ; and his lower jaw, his molars, and his brain, would leave no room for doubting the systematic position of the new genus. among those mammals, whose young are nourished during gestation by means of a placenta, or what are called the ‘ placental mammals.’ Further, the most superficial study would at once convince us that, among the orders of placental mammals, neither the Whales nor the hoofed creatures, nor the Sloths and Ant- TE ean A 76 eaters, nor the carnivorous Cats, Dogs, and Bears, still less the Rodent Rats and Rabbits, or the Insectivorous Moles and Hedgehogs, or the Bats, could claim our ‘Homo’ as one of themselves. There would remain then, but one order for comparison, that of the Apes (using that word in its broadest sense), and the question for discussion would narrow itself to this—is Man so different from any of these Apes that he must form an order by himself? Or does he differ less from them than they differ from one another, and hence must take his place in the same order with them ? Being happily free from all real, or imaginary, personal in- terest in the results of the inquiry thus set afoot, we should proceed to weigh the arguments on one side and on the other, with as much judicial calmness as if the question re- lated to a new Opossum. We should endeavour to ascertain, without seeking either to magnify or diminish them, all the characters by which our new Mammal differed from the Apes; and if we found that these were of less structural value, than those which distinguish certain members of the Ape order from others universally admitted to be of the same order, we should undoubtedly place the newly dis- covered tellurian genus with them. I now proceed to detail the facts which seem to me to leave us no choice but to adopt the last mentioned course. It is quite certain that the Ape which most nearly ap- proaches man, in the totality of its organization, is either the Chimpanzee or the Gorilla; and as it makes no prac- tical difference, for the purposes of my present argument, which is selected for comparison, on the one hand, with Man, and on the other hand, with the rest of the Primates,* I shall select the latter (so far as its organization is known) — TSS RTT * We are not at present thoroughly acquainted with the brain of the Gorilla, and therefore, in discussing cerebral characters, I shall take that of the Chim- panzce as my highest term among the Apes. ' 71 as a brute now so celebrated in prose and verse, that all must have heard of him, and have formed some conception of his appearance, I shall take up as many of the most important points of difference between man and this remarkable crea- ture, as the space at my disposal will allow me to discuss, and the necessities of the argument demand; and I shall in- quire into the value and magnitude of these differences, when placed side by side with those which separate the Go- ‘villa from other animals of the same order. In the general proportions of the body and limbs there is a remarkable difference between the Gorilla and Man, which at once strikes the eye. The Gorilla’s brain-case is smaller, its trunk larger, its lower limbs shorter, its upper limbs Annet in proportion than those of Man. I find that the the vertebral column of a full grown Go- rilla, in the Museum of the Royal College of Surgeons, mea- sures 27 inches along its anterior curvature, from the upper edge of the atlas, or first vertebra of the neck, to the lower extremity of the sacrum; that the arm, without the hand, is 314 inches long; that the leg, without the foot, is 264 inches long; that the hand is 92 inches long; the foot 114 inches long. . In other words, taking the length of the spinal column as 100, the arm equals 115, the leg 96, the hand 36, and the foot 41. In the skeleton of a male Bosjesman, in the same collec- tion, the proportions, by the same measurement, to the spinal column, taken as 100, are—the arm 78, the leg 110, the hand 26, and the foot 32. In a woman of the same race the arm is 83, and the leg 120, the hand and foot remaining the same. In a European skeleton I find the arm to be 80, the leg 117, the hand 26, the foot 35. Thus the leg is not so different as it looks at first sight, in its proportions to the spine in the Gorilla and in the Man— being very slightly shorter than the spime in the former, and between ;1; and + longer than the spine in the latter. The foot is longer and the hand much longer in the Gorilla; but the great difference is caused by the arms, which are very much longer than the spine in the Gorilla, very much shorter than the spine in the Man. The question now arises how are the other Apes related to the Gorilla in these respects—taking the length of the spine, measured in the same way, at 100. In an adult Chimpanzee, the arm is only 96, the leg 90, the hand 43, the foot 39 —so that the hand and the leg depart more from the human pro- portion and the arm less, while the foot is about the same as in the Gorilla. In the Orang, the arms are very much longer than i in the Gorilla (122), while the legs are shorter (88) ; the foot is longer than the hand (52 and 48), and both are much longer in proportion to the spine. In the other man-like Apes again, the Gibbons, these pro- portions are still further altered; the length of the arms being to that of the spinal column as 19 to 11; while the legs are also a third longer than the spinal column, so as to be longer — than in Man, instead of shorter. The hand is half as long as the spinal column, and the foot, shorter than the hand, is about =, ths of the length of the spinal column. Thus ee is as much longer in the arms than the Gorilla, as the Gorilla is longer in the arms than Man; while, on the other hand, it is as much longer in the legs than the Man, as the Man is longer in the legs than the Gorilla, so that it contains within itself the extremest deviations from the average length of both pairs of limbs (see the Frontispiece). The Mandrill presents a middle condition, the arms and legs being nearly equal in length, and both being shorter than the spinal column ; while hand and foot have nearly the same proportions to one another and to the spine, as in Man. In the Spider monkey (Afeles) the leg is longer than the spine, and the arm than the leg; and, finally, in that re- markable Lemurine form, the Indri, (Lichanotus) the leg is about -as long as the spinal column, while the arm is not 16) more than 14 of its length; the hand having rather less and the foot rather more, than one third the length of the spinal column. These examples might be greatly multiplied, but they suf- fice to show that, in whatever proportion of its limbs the Gorilla differs from Man, the other Apes depart still more widely from the Gorilla and that, consequently, such differ- ences of proportion can have no ordinal value. . We may next consider the differences presented by the trunk, consisting of the vertebral column, or backbone, and the ribs and pelvis, or bony hip-basin, which are connected with it, in Man and in the Gorilla respectively. In Man, in consequence partly of the disposition of the — articular surfaces of the vertebre, and largely of the elastic tension of some of the fibrous bands, or ligaments, which con- nect these vertebra together, the spinal column, as a whole, has an elegant S-like curvature, being convex forwards in the neck, concave in the back, convex in the loins, or lumbar region, and concave again in the sacral region ; an arrange- ment which gives much elasticity to the whole backbone, and diminishes the jar communicated to the spine, and through it to the head, by locomotion in the erect position. Furthermore, under ordinary circumstances, Man has seven vertebre in his neck, which are called cervical; twelve succeed these, bearing ribs and forming the upper part of the back, whence they are termed dorsal ; five lie in the loins, bearing no distinct, or free, ribs, and are called lumbar ; five, united together into a great bone, excavated in front, solidly wedged in between the hip bones, to form the back of the pelvis, and. known by the name of the sacrum, succeed these ; and finally, three or four little more or less moveable bones, so small as to be insignificant, constitute the coccyx or rudimentary tail. In the Gorilla, the vertebral column is similarly divided into cervical, dorsal, lumbar, sacral and coccygeal vertebrz, and the total number of cervical and dorsal vertebrae, taken to- i 2a my gether, is the same as in man; but the development of a pair of ribs to the first lumbar vertebra, which is an exceptional occurrence in Man, is the rule in the Gorilla; and hence, as lumbar are distinguished from dorsal vertebree only by the presence or absence of free ribs, the seventeen “ dorso- lumbar” vertebre of the Gorilla are divided into thirteen dorsal and four lumbar, while in Man they are twelve dorsal and five lumbar. Not only, however, does Man occasionally possess thirteen pair of ribs,* but the Gorilla sometimes has fourteen pairs, while an Orang-Utan skeleton in the Museum of the Royal College of Surgeons has twelve dorsal and five lumbar verte- bre, asin Man. Cuvier notes the same number in a Hylo- bates. On the other hand, among the lower Apes, many possess twelve dorsal and six or seven lumbar vertebre; the Douroucouli has fourteen dorsal and eight lumbar, and a : Lemur (Stenops tardigradus) has fifteen dorsal and nine lumbar vertebre. - The vertebral column of the Gorilla, as a whole, differs from that of Man in the less marked character of its curves, especially in the slighter convexity of the lumbar region. Nevertheless, the curves are present, and are quite obvious in young skeletons of the Gorilla and Chimpanzee which have been prepared without removal of the ligaments. In young Orangs similarly preserved, on the other hand, the spinal column is either straight, or even concave forwards, through- out the lumbar region. Whether we take these characters then, or such minor ones as those which are derivable from the proportional length of the spines of the cervical vertebre, and the like, there is * ‘More than once,” says Peter Camper, “have I met with more than six lumbar vertebre inman. . . - Once I found thirteen ribs and four lumbar vertebra.” Fallopius noted thirteen pair of ribs and only four lumbar vertebre; and Eustachius once found eleven dorsal vertebre and six lumbar vertebree. —‘(CEuvres de Pierre Camper,’ T. 1, p.42. As Tyson states, his ‘ Pygmie’ had thirteen pair of ribs and five lumbar vertebra. The question of the curves of the spinal column in the Apes requires further investigation. $9 son , 75 no doubt whatsoever as to the marked difference between Man and the Gorilla; but there is as little, that equally marked differences, of the very same order, obtain between the Gorilla and the lower apes. , : ALT Sen aft Th YC (i UA RANT Adan Hi i | t | iN ALN AN thi i NN (1A) ( {f etl NNN RM TTY UR BSN nh pag 4 i 4 aw Ny \ YN Eee Cae = Saget IN @ if Gorilla, “ONE Giboon. Fig. 16.—Front and side views of the bony pelvis of Man, the Gorilla and Gibbon: reduced from drawings made from nature, of the same absolute length, by Mr. Waterhouse Hawkins, a ee se ET orn LOGE A te EE . = — 76 The Pelvis, or bony girdle of the hips, of Man is a strik- ingly human part of his organization ; the expanded haunch pones affording support for his viscera during his habitually erect posture, and giving space for the attachment of the great muscles which enable him to assume and to preserve that attitude. In these respects the pelvis of the Gorilla differs very considerably from his (Fig. 16). But go no lower than the Gibbon, and see how vastly more he differs from the Gorilla than the latter does from Man, even in this structure. Look at the flat, narrow haunch bones—the long and narrow passage—the coarse, outwardly curved, ischiatic prominences on which the Gibbon habitually rests, and which are coated by the so-called “ callosities,” dense patches of skin, wholly absent in the Gorilla, in the Chimpanzee, and in the Orang, asin Man! _ In the lower Monkeys and in the Lemurs the difference becomes more striking still, the pelvis acquiring an alto- gether quadrupedal character. But now let us turn to a nobler and more characteristic organ—that by which the human frame seems to be, and indeed is, so strongly distinguished from all others, — I mean the skull. The differences between a Gorilla’s skull and a Man’s are truly immense (Fig. 17). In the former, the face, formed largely by the massive jaw-bones, predominates over the brain case, or cranium proper: in the latter, the propor- tions of the two are reversed. In the Man, the occipital - foramen, through which passes the great nervous cord con- necting the brain with the nerves of the body, is placed just behind the centre of the base of the skull, which thus be- comes evenly balanced in the erect posture; in the Gorilla, it lies in the posterior third of that base. In the Man, the surface of the skull is comparatively smooth, and the supra- ciliary ridges or brow prominences usually project but littl— while, in the Gorilla, vast crests are developed upon the skull, and the brow ridges overhang the cavernous orbits, like great penthouses. —_— 77 Sections of the skulls, however, show that some of the ap- parent defects of the Gorilla’s cranium arise, in fact, not so much from deficiency of brain case as from excessive deve- lopment of the parts of the face. The cranial cavity is not , ill-shaped, and the forehead is not truly flattened or very re- treating, its really well-formed curve being simply disguised by the mass of bone which is built up against it (Fig. 17). But the roofs of the orbits rise more obliquely into the cranial cavity, thus diminishing the space for the lower part of the anterior lobes of the brain, and the absolute capacity of the cranium is far less than that of Man. So far as I am aware, no human cranium belonging to an adult man has yet been observed with a less cubical capacity than 62 cubic inches, the smallest cranium observed in any race.of men by Morton, measuring 63 cubic inches; while, on the other hand, the most capacious Gorilla skull yet measured has a content of not more than 34} cubic inches. Let us assume, for simplicity’s sake, that the lowest Man’s skull has twice _ the capacity of that of the highest Gorilla, * * It has been affirmed that Hindoo crania sometimes contain as little as 27 ounces of water, which would give a capacity of about 46 cubic inches. The minimum capacity which I have assumed above, however, is based upon the valuable tables published by Professor R. Wagner in his “ Vorstudien zu einer wissenschaftlichen Morphologie und Physiologie des menschlichen Gehirns.” As the result of the careful weighing of more than 900 human brains, Pro- fessor Wagner states that one-half weighed between 1200 and 1400 grammes, and that about two-ninths, consisting for the most part of male brains, exceed 1400 grammes. The lightest brain of an adult male, with sound mental facul- ties, recorded by Wagner, weighed 1020 grammes. As a gramme equals 15.4 grains, and a cubic inch of water contains 252.4 grains, this is equivalent to 62 cubic inches of water ; so that as brain is heavier than water, we are perfectly safe against erring on the side of diminution in taking this as the smallest capacity of any adult male human brain. The only adult male brain, weighing as little as 970 grammes, is that of an idiot ; but the brain of an adult woman, against the soundness of whose faculties nothing appears, weighed as little as 907 grammes (55.3 cubic inches of water); and Reid gives an adult female brain of still smaller capacity. The heaviest brain (1872 grammes, or about 115 cubic inches) was, however, that of a woman ; next to it comes the brain of Cuvier (1861 grammes), then Byron (1807 grammes), and then an insane = — = ¢ as . = ar |? Leia aaiacasekeaiaseaaiaiaseia (2 i 78 No doubt, this is a very striking difference, but it loses much of its apparent systematic value, when viewed by the light of certain other equally indubitable facts respecting cranial capacities. The first of these is, that the difference in the volume of the cranial cavity of different races of mankind is far greater, absolutely, than that between the lowest Man and the highest Ape, while, relatively, it is about the same. For the largest human skull measured by Morton, contained 114 cubic inches, that is to say, had very nearly double the capacity of the smallest; while its absolute preponderance, of 52 cubic inches—is far greater than that by which the lowest adult male human cranium surpasses the largest of the Gorillas (62 —341= 271). Secondly, the adult crania of Gorillas which have as yet been measured differ among themselves by nearly one-third, the maximum capacity being 34.5 cubic inches, the minimum 24 cubic inches; and, thirdly, after making all due allowance for difference of size, the cranial capacities of some of the lower apes fall nearly as much, relatively, below those of the higher Apes as the latter fall below Man. Thus, even in the important matter of cranial capacity, Men differ more widely from one another than they do from the Apes; while the lowest Apes differ as much, in propor- tion, from the highest, as the latter does from Man. The last proposition is still better illustrated by the study of the modifications which other parts of the cranium undergo in the Simian series. It is the large proportional size of the facial bones and the great projection of the jaws which confers upon the Gorilla’s skull its small facial angle and brutal character. ; person (1783 grammes). The lightest adult brain recorded (720 grammes) was that of an idiotic female. The brains of five children, four years old, weighed between 1275 and 992 grammes. So that it may be safely said, that an average European child of four years old has a brain twice as large as that of an adult Gorilla. 79 But if we consider the proportional size of the facial bones to the skull proper only, the little Chrysothrix (Fig.17) differs AUSTRALIAN. CHRYSOTHRIX. CYNOCEPHALUS, Fig. 17.—Sections of the skulls of Man and various Apes, drawn so as to give the cerebral cavity the same length in each case, thereby displaying the varying | | Se TSE patiiatneaandaatetiim anaes = = = SN nae aT = ee nea —_ Rr 80 very widely from the Gorilla and, in the same way, as Man does; while the Baboons (Cynocephalus, Fig.17) exaggerate the gross proportions of the muzzle of the great Anthropoid, so that its visage looks mild and human by comparison with theirs. The difference between the Gorilla and the Baboon is even greater than it appears at first sight; for the great facial mass of the former is largely due to a downward de- velopment of the jaws; an essentially human character, super- added upon that almost purely forward, essentially brutal, development of the same parts which characterizes the Baboon, and yet more remarkably distinguishes the Lemur. Similarly, the occipital foramen of Mycetes (Fig. 17); and still more of the Lemurs, is situated completely in the pos- terior face of the skull, or as much further back than that of the Gorilla, as that of the Gorilla is further back than that of Man; while, as if to render patent the futility of the attempt to base any broad classificatory distinction on such a character, the same group of Platyrhine, or American monkeys, to which the Mycetes belongs, contains the Chrysothriz, whose occipital foramen is situated far more forward than in any other ape, and nearly approaches the position it holds in Man. Again, the Orang’s skull is as devoid of excessively de- veloped supraciliary prominences as a Man’s, though some varieties exhibit great crests elsewhere (see p. 41) ; and in some of the Cebine apes and in the Chrysothria, the cranium is as smooth and rounded as that of Man himself. What is true of these leading characteristics of the skull, holds good, as may be imagined, of all minor features; so that for every constant difference between the Gorilla’s skull proportions of the facial bones. ‘The line dD indicates the plane of the tentorium, which separates the cerebrum from the cerebellum ; d, the axis of the occipital outlet of the skull. The extent of cerebral cavity behind c, which is a perpen- dicular erected on } at the point where the tentorium is attached posteriorly, indicates the degree to which the cerebrum overlaps the cerebellum—the space occupied by which is roughly indicated by the dark shading. In comparing these diagrams, it must be recollected, that figures on so small a scale as these simply exemplify the statements in the text, the proof of which is to be found in the objects themselves, “——e 81 and the Man’s, a similar constant difference of the same order (that is to say, consisting in excess or defect of the same quality) may be found between the Gorilla’s skull and that of some other ape. So that, for the skull, no less than for the skeleton in general, the proposition holds good, that the differences between Man and the Gorilla are of smaller J value than those between the Gorilla and some other Apes: In connection with the skull, I may speak of the teeth —organs which have a peculiar classificatory value, and whose resemblances and differences of number, form, and succession, taken as a whole, are usually regarded as more trustworthy indicators of affinity than any others. Man is provided with two sets of teeth—milk teeth and permanent teeth. The former consist of four incisors, or cutting teeth ; two canines, or eye-teeth ; and four molars, or grinders, in each jaw, making twenty in all. The latter (Fig. 18) comprise four incisors, two canines, four small grinders, called premolars or false molars, and six large | grinders, or true molars in each jaw—making thirty-two in all. The internal incisors are larger than the external pair, in the upper jaw, smaller than the external pair, in the lower jaw. The crowns of the upper molars exhibit four cusps, or blunt-pointed elevations, and a ridge crosses the crown ob- liquely, from the inner, anterior, cusp to the outer, posterior cusp (Fig. 18 m*). The anterior lower molars have five cusps, three external and two internal. The premolars have two cusps, one internal and one external, of which the outer is the higher, In all these respects the dentition of the Gorilla may be described in the same terms as that of Man ; but in other matters it exhibits many and important differences (Fig. 18), Thus the teeth of man constitute a regular and even series—without any break and without any marked projec- tion of one tooth above the level of the rest 3 a peculiarity which, as Cuvier long ago showed, is shared by no other G ieee naan eermacemmioaas ams et e=