THE FACIAL LINE OF CAMPER.
In order to determine the cerebral mass, and, consequently, the intellectual faculties, Camper draws a base line from the roots of the upper incisors, to the external auditory passage; then another straight line, from the upper incisors to the most elevated point of the forehead: according to him, the intellectual faculties of the man or animal, are in direct proportion to the magnitude of the angle, made by those two lines. Lavater, with this idea for a basis, constructed a scale of perfection from the frog to the Apollo Belvidere. As nature really furnishes many proofs in support of this opinion, it has been generally received, even by anatomists and physiologists; and, notwithstanding the arguments by which it is victoriously opposed, the learned cannot resolve to abandon it. Cuvier himself furnishes a list of men and animals, in support of this doctrine; few naturalists oppose it, but almost all give it their support.[61]
Camper’s attempt necessarily failed; for his manner of drawing the lines and measuring the facial angle, enabled him to take into consideration the anterior parts only of the brain situated near the forehead: he entirely neglects the posterior, lateral, and inferior cerebral parts. This method, then, at most, could decide upon those faculties only, whose organs are placed near the forehead.
Cuvier estimates the facial angle of the new-born infant at ninety degrees; that of the adult, at eighty-five; that of decrepit old age, at fifty.
From this statement it appears, that, at different ages, changes take place in the form, either of the brain or the cranium; hereafter I shall prove that such changes really occur.
The forehead of the newborn infant is flattened; on the contrary, that of a child some months old, and until the age of eight or ten years, especially in the case of boys possessed of superior talents, it is projecting, and forms, notwithstanding the approximation to the age of puberty, a larger facial angle than in the adult; this angle, therefore, does not diminish in the inverse ratio of the age. In like manner we find decrepit old men, whose facial angle is as great as it was in the vigor of manhood; for, although in decrepitude the brain is subject to atrophy, there are old men, the exterior contour of whose crania undergoes no change. The angle, as stated by Cuvier, for different ages, were measured upon different individuals; if it were estimated upon the same persons at different epochs of his life, the result would be entirely different.
In general, the proportion between the forehead and the face, is different in different individuals. No conclusion can be drawn from the proportions, which exist in one person, relative to those of another; among a hundred individuals of the same sex and age, no two can be found, in whom the same proportion exists between the forehead and the face; it necessarily follows, then, that no two will have the same facial angle. Physiologists seem to admit, that the proportion between the brain and the bones of the face, is different in different species of animals: but they appear to think that, in all the individuals of the same species, all the young, all the adults, all the old, there exists a constant proportion between the cerebral mass and the face.
The researches of Blumenbach show that threefourths of the animals known, have nearly the same facial angle; and yet what a disparity between their instincts and faculties! What information, then, do we derive from Camper’s facial angle?
Moreover, as Cuvier himself observes, the cerebral mass is by no means placed in all animals, immediately behind or beneath what is called the forehead. In a great many species of animals, on the contrary, the external table of the frontal is at a considerable distance from the internal, and this distance increases with the age of the animal. The brain of the swine is placed an inch lower than the frontal bones seem to indicate; that of the ox, in some parts three inches; that of the elephant, from six to thirteen. In other animals, the measurement is generally commenced at the frontal sinus instead of the cerebrum. From these considerations, Cuvier was induced to draw a tangent to the internal instead of the external surface of the cranium. The cerebrum of the wolf and many species of dogs, especially when the individuals are very old, is placed directly behind the frontal sinuses. In the wolf, especially the large and most ferocious variety, it is depressed as in the hyena; in the dog it is situated higher or lower, according to the species; but, notwithstanding this difference in the situation of the brain, the facial angle, as it is commonly measured, must be the same; from this the inference would be, that the dog, the wolf, and the hyena, have the same qualities, and each in the same degree. In the greater part of the rodentia, the morse, &c., the brain is so depressed and so placed behind the frontal sinuses, that the facial line cannot be drawn. The facial line of the cetacea, on account of the singular conformation of the head, would lead to results absolutely false.
I know many negroes, who, with very prominent jaws, are quite distinguished for their intellectual faculties; yet the projection of the jaws renders the facial angle much more acute, than it would be with the usual conformation of Europeans. In order that the same angle should exist in a European, the forehead must be flattened and retreating. But the foreheads of the negroes in question, on the contrary, are very projecting. Who, under these circumstances, would expect to find the same amount of intellect corresponding to the same facial angle?