CHAPTER X.
QUESTION OF UNITY OR PLURALITY OF SPECIES
Systems of Camper, Blumenbach, Morton, Carus – Investigations of Owen, Vrolik, Weber – Prolificness of hybrids, the great scientific stronghold of the advocates of unity of species.
It will be necessary to determine first the physiological bearing of the word race.
In the opinion of many scientific observers, who judge from the first impression, and take extremes116 as the basis of their reasoning, the groups of the human family are distinguished by differences so radical and essential, that it is impossible to believe them all derived from the same stock. They, therefore, suppose several other genealogies besides that of Adam and Eve. According to this doctrine, instead of but one species in the genus homo, there would be three, four, or even more, entirely distinct ones, whose commingling would produce what the naturalists call hybrids.
General conviction is easily secured in favor of this theory, by placing before the eyes of the observer instances of obvious and striking dissimilarities among the various groups. The critic who has before him a human subject with a skin of olive-yellow; black, straight, and thin hair; little, if any beard, eyebrows, and eyelashes; a broad and flattened face, with features not very distinct; the space between the eyes broad and flat; the orbits large and open; the nose flattened; the cheeks high and prominent; the opening of the eyelids narrow, linear, and oblique, the inner angle the lowest; the ears and lips large; the forehead low and slanting, allowing a considerable portion of the face to be seen when viewed from above; the head of somewhat a pyramidal form; the limbs clumsy; the stature humble; the whole conformation betraying a marked tendency to obesity:117 the critic who examines this specimen of humanity, at once recognizes a well characterized and clearly defined type, the principal features of which will readily be imprinted in his memory.
Let us suppose him now to examine another individual: a negro, from the western coast of Africa. This specimen is of large size, and vigorous appearance. The color is a jetty black, the hair crisp, generally called woolly; the eyes are prominent, and the orbits large; the nose thick, flat, and confounded with the prominent cheeks; the lips very thick and everted; the jaws projecting, and the chin receding; the skull assuming the form called prognathous. The low forehead and muzzle-like elongation of the jaws, give to the whole being an almost animal appearance, which is heightened by the large and powerful lower-jaw, the ample provision for muscular insertions, the greater size of cavities destined for the reception of the organs of smell and sight, the length of the forearm compared with the arm, the narrow and tapering fingers, etc. "In the negro, the bones of the leg are bent outwards; the tibia and fibula are more convex in front than in the European; the calves of the legs are very high, so as to encroach upon the hams; the feet and hand, but particularly the former, are flat; the os calcis, instead of being arched, is continued nearly in a straight line with the other bones of the foot, which is remarkably broad."118
In contemplating a human being so formed, we are involuntarily reminded of the structure of the ape, and we feel almost inclined to admit that the tribes of Western Africa are descended from a stock which bears but a slight and general resemblance to that of the Mongolian family.
But there are some groups, whose aspect is even less flattering to the self-love of humanity than that of the Congo. It is the peculiar distinction of Oceanica to furnish about the most degraded and repulsive of those wretched beings, who seem to occupy a sort of intermediate station between man and the mere brute. Many of the groups of that latest-discovered world, by the excessive leanness and starveling development of their limbs;119 the disproportionate size of their heads; the excessive, hopeless stupidity stamped upon their countenances; present an aspect so hideous and disgusting, that – contrasted with them – even the negro of Western Africa gains in our estimation, and seems to claim a less ignoble descent than they.
We are still more tempted to adopt the conclusions of the advocates for the plurality of species, when, after having examined types taken from every quarter of the globe, we return to the inhabitants of Europe and Southern and Western Asia. How vast a superiority these exhibit in beauty, correctness of proportion, and regularity of features! It is they who enjoy the honor of having furnished the living models for the unrivalled masterpieces of ancient sculpture. But even among these races there has existed, since the remotest times, a gradation of beauty, at the head of which the European may justly be placed, as well for symmetry of limbs as for vigorous muscular development. Nothing, then, would appear more reasonable than to pronounce the different types of mankind as foreign to each other as are animals of different species.
Such, indeed, was the conclusion arrived at by those who first systematized their observations, and attempted to establish a classification; and so far as this classification depended upon general facts, it seemed incontestable.
Camper took the lead. He was not content with deciding upon merely superficial appearances, but wished to rest his demonstrations upon a mathematical basis, by defining, anatomically, the distinguishing characteristics of different types. If he succeeded in this, he would thereby establish a strict and logical method of treating the subject, preclude all doubt, and give to his opinions that rigorous precision without which there is no true science. I borrow from Mr. Prichard,120 Camper's own account of his method. "The basis on which the distinction of nations121 is founded, says he, may be displayed by two straight lines; one of which is to be drawn through the meatus auditorius (the external entrance of the ear) to the base of the nose; and the other touching the prominent centre of the forehead, and falling thence on the most prominent part of the upper jaw-bone, the head being viewed in profile. In the angle produced by these two lines, may be said to consist, not only the distinctions between the skulls of the several species of animals, but also those which are found to exist between different nations; and it might be concluded that nature has availed herself of this angle to mark out the diversities of the animal kingdom, and at the same time to establish a scale from the inferior tribes up to the most beautiful forms which are found in the human species. Thus it will be found that the heads of birds display the smallest angle, and that it always becomes of greater extent as the animal approaches more nearly to the human figure. Thus, there is one species of the ape tribe, in which the head has a facial angle of forty-two degrees; in another animal of the same family, which is one of those simiæ most approximating in figure to mankind, the facial angle contains exactly fifty degrees. Next to this is the head of an African negro, which, as well as that of the Kalmuc, forms an angle of seventy degrees; while the angle discovered in the heads of Europeans contains eighty degrees. On this difference of ten degrees in the facial angle, the superior beauty of the European depends; while that high character of sublime beauty, which is so striking in some works of ancient statuary, as in the head of Apollo, and in the Medusa of Sisocles, is given by an angle which amounts to one hundred degrees."
This method was seductive from its exceeding simplicity. Unfortunately, facts were against it, as happens to a good many theories. The curious and interesting discoveries of Prof. Owen have proved beyond dispute, that Camper, as well as other anatomists since him, founded all their observations on orangs of immature age, and that, while the jaws become enlarged, and lengthened with the increase of the maxillary apparatus, and the zygomatic arch is extended, no corresponding increase of the brain takes place. The importance of this difference of age, with respect to the facial angle, is very great in the simiæ. Thus, while Camper, measuring the skull of young apes, has found the facial angle even as much as sixty-four degrees; in reality, it never exceeds, in the most favored specimen, from thirty to thirty-five. Between this figure and the seventy degrees of the negro and Kalmuc, there is too wide a gap to admit of the possibility of Camper's ascending series.
The advocates of phrenological science eagerly espoused the theory of the Dutch savant. They imagined that they could detect a development of instincts corresponding to the rank which the animal occupied in his scale. But even here facts were against them. It was objected that the elephant – not to mention numerous other instances – whose intelligence is incontestably superior to that of the orang, presents a much more acute facial angle than the latter. Even among the ape tribes, the most intelligent, those most susceptible of education, are by no means the highest in Camper's scale.
Besides these great defects, the theory possessed another very weak point. It did not apply to all the varieties of the human species. The races with pyramidal skulls found no place in it. Yet this is a sufficiently striking characteristic.
Camper's theory being refuted, Blumenbach proposed another system. He called his invention norma verticalis, the vertical method. According to him,122 the comparison of the breadth of the head, particularly of the vertex, points out the principal and most strongly marked differences in the general configuration of the cranium. He adds that the whole cranium is susceptible of so many varieties in its form, the parts which contribute more or less to determine the national character displaying such different proportions and directions, that it is impossible to subject all these diversities to the measurement of any lines and angles. In comparing and arranging skulls according to the varieties in their shape, it is preferable to survey them in that method which presents at one view the greatest number of characteristic peculiarities. "The best way of obtaining this end is to place a series of skulls, with the cheek-bones on the same horizontal line, resting on the lower jaws, and then, viewing them from behind, and fixing the eye on the vertex of each, to mark all the varieties in the shape of parts that contribute most to the national character, whether they consist in the direction of the maxillary and malar bones, in the breadth or narrowness of the oval figure presented by the vertex, or in the flattened or vaulted form of the frontal bone."
The results which Blumenbach deduced from this method, were a division of mankind into five grand categories, each of which was again subdivided into a variety of families and types.
This classification, also, is liable to many objections. Like Camper's, it left out several important characteristics. Owen supposed that these objections might be obviated by measuring the basis of the skull instead of the summit. "The relative proportions and extent," says Prichard, "and the peculiarities of formation of the different parts of the cranium, are more fully discovered by this mode of comparison, than by any other." One of the most important results of this method was the discovery of a line of demarcation between man and the anthropoid apes, so distinct, and clearly drawn, that it becomes thenceforward impossible to find between the two genera the connecting link which Camper supposed to exist. It is, indeed, sufficient to cast one glance at the bases of two skulls, one human, and the other that of an orang, to perceive essential and decisive differences. The antero-posterior diameter of the basis of the skull is, in the orang, very much longer than in man. The zygoma is situated in the middle region of the skull, instead of being included, as in all races of men, and even human idiots, in the anterior half of the basis cranii; and it occupies in the basis just one-third part of the entire length of its diameter. Moreover, the position of the great occipital foramen is very different in the two skulls; and this feature is very important, on account of its relations to the general character of structure, and its influence on the habits of the whole being. This foramen, in the human head, is very near the middle of the basis of the skull, or, rather, it is situated immediately behind the middle transverse diameter; while, in the adult chimpantsi, it is placed in the middle of the posterior third part of the basis cranii.123
Owen certainly deserves great credit for his observations, but I should prefer the most recent, as well as ingenious, of cranioscopic systems, that of the learned American, Dr. Morton, which has been adopted by Mr. Carus.124
The substance of this theory is, that individuals are superior in intellect in proportion as their skulls are larger.125 Taking this as the general rule, Dr. Morton and Mr. Carus proceed thereby to demonstrate the difference of races. The question to be decided is, whether all types of the human race have the same craniological development.
To elucidate this fact, Dr. Morton took a certain number of skulls, belonging to the four principal human families – Whites, Mongolians, Negroes, and North American Indians – and, after carefully closing every aperture, except the foramen magnum, he measured their capacity by filling them with well dried grains of pepper. The results of this measurement are exhibited in the subjoined table.126
The results given in the first two columns are certainly very curious, but to those in the last two I attach little value. These two columns, giving the maximum and minimum capacities, differ so greatly from the second, which shows the average, that they could be of weight only if Mr. Morton had experimented upon a much greater number of skulls, and if he had specified the social position of the individuals to whom they belonged. Thus, for his specimens of the white and copper-colored races, he might select skulls that had belonged to individuals rather above the common herd.127 But the Blacks and Mongolians were not represented by the skulls of their great chiefs and mandarins. This explains why Dr. Morton could ascribe the figure 100 to an aboriginal of America, while the most intelligent Mongolian that he examined did not exceed 93, and is surpassed even by the negro, who reaches 94. Such results are entirely incomplete, fortuitous, and of no scientific value. In questions of this kind, too much care cannot be taken to reject conclusions which are based upon the examination of individualities. I am, therefore, unable to accept the second half of Dr. Morton's calculations.
I am also disposed to doubt one of the details in the other half. The figures 100, 83, and 78, respectively indicating the average capacity of the skull of the white, Mongolian, and negro, follow a clear and evident gradation. But the figures 83, 81, and 82, given for the Mongol, the Malay, and the red-skin, are conflicting; the more so, as Mr. Carus does not hesitate to comprise the Mongols and Malays into one and the same race, and thus unites the figures 83 and 81 – by which he receives, as the average capacity of the yellow race, 82, or the same as that of the red-skins. Wherefore, then, take the figure 82 as the characteristic of a distinct race, and thus create, quite arbitrarily, a fourth great subdivision of our species.
This anomaly supports the weak side of Mr. Carus's system. The learned Saxon amuses himself by supposing that, just as we see our planet pass through the four stages of day, night, morning twilight, and evening twilight, so there must be four subdivisions of the human species, corresponding to these variations of light. He perceives in this a symbol,128 which is always a dangerous temptation to a mind of refined susceptibilities. The white races are to him the nations of day; the black, those of night; the yellow, those of morning; the red, those of evening. It will be perceived how many ingenious analogies may be brought forward in support of this fanciful invention. Thus, the European nations, by the brilliancy of their scientific discoveries and their superior civilization, are in an enlightened state, while the blacks are plunged in the gloomy darkness of ignorance. The Eastern nations live in a sort of twilight, which affords them an incomplete, though powerful, social existence. And as for the Indians of the Western World, who are rapidly disappearing, what more beautiful image of their destiny can be found than the setting sun?
Unfortunately, parables are no arguments, and Mr. Carus has somewhat injured his beautiful theory by unduly abandoning himself to this poetical current. Moreover, what I have said with regard to all other ethnological theories – those of Camper, Blumenbach, and Owen – holds good of this: Mr. Carus does not succeed in systematizing regularly the whole of the physiological diversities observable in races.129
The advocates for unity of species have not failed to take advantage of this inability on the part of their opponents to find a system which will include the many varieties of the human family; and they pretend that, as the observations upon the conformation of the skull cannot be reduced to a system which demonstrates the original separation of types, the different varieties must be regarded as simple divergencies occasioned by adventitious and secondary causes, and which do not prove a difference of origin.
This is crying victory too soon. The difficulty of finding a method does not always prove that none can be found. But the believers in the unity of species did not admit this reserve. To set off their theory, they point to the fact that certain tribes, belonging to the same race, instead of presenting the same physical type, diverge from it very considerably. They cite the different groups of the mixed Malay-Polynesian family; and, without paying attention to the proportion of the elements which compose the mixtures, they say that if groups of the same origin can assume such totally different craniological and facial forms, the greatest diversities of that kind do not prove the primary plurality of origins.130 Strange as it may be to European eyes, the distinct types of the negro and the Mongolian are not then demonstrative of difference of species; and the differences among the human family must be ascribed simply to certain local causes operating during a greater or less lapse of time.131
The advocates for the plurality of races, being met with so many objections, good as well as bad, have attempted to enlarge the circle of their arguments, and, ceasing to make the skull their only study, have proceeded to the examination of the entire individual. They have rightly shown that the differences do not exist merely in the aspect of the face and formation of the skull, but, what is no less important, they exist also in the shape of the pelvis, the relative proportion of the limbs, and the nature of the pilous system.
Camper and other naturalists had long since perceived that the pelvis of the negro presented certain peculiarities. Dr. Vrolik extended his researches further, and observed that in the European race the differences between the male and female pelvis are much less distinctly marked, while the pelvis of the negro, of either sex, partakes in a very striking degree of the animal character. The Amsterdam savant, starting from the idea that the formation of the pelvis necessarily influences that of the fœtus, concludes that there must be difference of origin.132
Mr. Weber has attacked this theory with but little success. He was obliged to allow that certain formations of the pelvis occur more frequently in one race than in another; and all he could do, was to show that the rule is not without exceptions, and that some individuals of the American, African, or Mongol race presented the forms common among the European. This is not proving a great deal, especially as it never seems to have occurred to Mr. Weber that these exceptions might be owing to a mixture of blood.
The adversaries of the unity doctrine pretend that the European is better proportioned. They are answered that the excessive leanness of the extremities among those nations which subsist principally on vegetable diet, or whose alimentation is imperfect, is not at all surprising; and this reply is certainly valid. But a much less conclusive reply is made to the argument drawn from the excessive development of bust among the mountaineers of Peru (Quichuas) by those who are unwilling to recognize it as a specific characteristic; for to pretend, as they do, that it can be explained by the elevation of the Andes, is not advancing a very serious reason.133 There are in the world many mountain populations who are constituted very differently from the Quichuas.134
The color of the skin is another argument for diversity of origin. But the opposite party refuse to accept this as a specific characteristic, for two reasons: first, because, they say, this coloration depends upon climatic circumstances, and is not permanent – which is, to say the least of it, a very bold assertion; secondly, because color is liable to indefinite gradations, by which white insensibly passes into yellow, yellow into black, so that it is impossible to find a line of demarcation sufficiently decided. This fact simply proves the existence of innumerable hybrids; an observation to which the advocates for unity are constantly inattentive.
With regard to the specific differences in the formation of the pile, Mr. Flourens brings his great authority in favor of the original unity of race.135
I have now passed rapidly in review the more or less inconsistent arguments of the advocates of unity; but their strongest one still remains. It is of great force, and I therefore reserved it for the last – the facility with which the different branches of the human family produce hybrids, and the fecundity of these hybrids themselves.
The observations of naturalists seem to have well established the fact that half-breeds can spring only from nearly related species, and that even in that case they are condemned to sterility. It has been further observed that, even among closely allied species, where fecundation is possible, copulation is repugnant, and obtained, generally, either by force or ruse, which would lead us to suppose that, in a state of nature, the number of hybrids is even more limited than that obtained by the intervention of man. It has, therefore, been concluded that, among the number of specific characteristics, we must place the faculty of producing prolific offspring.
As nothing authorizes us to believe that the human race are exempt from this law, so nothing has hitherto been able to shake the strength of this objection,136 which, more than all the others, holds the advocates for plurality in check. It is, indeed, affirmed that, in certain portions of Oceanica, indigenous women, after having brought forth a half-breed European child, can no longer be fecundated by compatriots. If this assertion be admitted as correct, it might serve as a starting point for further investigations; but at present it could not be used to invalidate the admitted principles of science upon the generation of hybrids – against the deductions drawn from these it proves nothing.