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.