Camper, the famous Dutch physiologist, has, with more exactness and in an exceptional way, characterized this line as the line of facial beauty; he in fact discovers therein the main distinction between the form of the human visage and the profile of animal life; and on account of this follows up the modifications of this feature throughout the various human races. In this respect his researches are no doubt in conflict with those of Blumenbach[156]. Speaking generally, however, the line adverted to is in fact a most marked means of distinction between the outward form of man and animal. Among animals, it is true, muzzle and nasal bone also form a more or less straight line, but the specific projection of the animal's snout, which is forced to the front, as being in the nearest practical relation to objects, is essentially determined through its connection with the skull, united to which the ear is moreover placed above or below, so that in the present instance the line that is carried forward from the skull to the root of the nose or the upper jaw, where the teeth are in position, forms an acute angle instead of a right angle as is found in the case of man. Everybody can independently feel in a general way the strength of this distinction, which no doubt opens the path to more definite thinking on the subject. (_αα_) In the formation of the head of animals the most insistent feature is the mouth as the organ by means of which it feeds in co-operation with the upper and lower jaws, the teeth, and the muscles of mastication. All the other organs are subordinate and in a position of subservience to this principal feature. Notably the snout as a means of scenting food, the eyes being to a lesser degree instrumental in spying it out. The express insistence on these animal features as exclusively devoted to the natural wants and their satisfaction gives to the head of the animal the appearance as though intended merely to satisfy natural functions without any trace of spiritual ideality. For this reason the entire animal organism is rendered intelligible from the mouth as a point of departure. A specific mode of nourishment, that is to say, requires a specific structure of the muzzle, a particular formation of the teeth, together with which the structure of the jaw bones, the muscles of mastication, cheek-bones, and, moreover, the vertebrae, the thighbones, claws, and so forth all stand in the closest relation. The body of the animal merely subserves natural ends and on account of this dependence on the purely material aspect of nourishment gives the impression of absence of spirit. If, then, the human countenance is, even in its bodily conformation, to possess a spiritual stamp, those organs which in the animal form are so predominant must in the case of man, retire from such a pre-eminence and give way to those which do not so much suggest a practical relation as one that is referable to the ideality of mind.