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,[122] Camper's own account of his method. "The basis on which the distinction of nations[123] 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,[124] 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.[125]

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.[126]