But I leave Helvetius and Condillac, and I return to Descartes, to Willis, to Lapeyronie, to Haller, Sœmmerring, Cuvier, &c. They all perceived and all asserted that the brain is the seat of the soul, and that it is so to the exclusion of the senses. Therefore, the proposition that the brain is the exclusive seat of the soul is not a new proposition, and hence does not originate with Gall. It belonged to science before it appeared in his Doctrine. The merit of Gall, and it is by no means a slender merit, consists in his having understood better than any of his predecessors the whole of its importance, and in having devoted himself to its demonstration. It existed in science before Gall appeared—it may be said to reign there ever since his appearance. Taking each particular sense, he excluded them all, one after another, from all immediate participation in the functions of the understanding.[18] Far from being developed in the direct ratio of the intellection, most of them are developed in an inverse ratio. Taste and smell are more developed in the quadruped than in man. Sight and hearing are more so in the bird than in the quadruped. The brain alone is in all classes developed in the ratio of the understanding. The loss of a sense does not lead to the loss of the intelligence. The understanding survives the loss of sight and hearing. It might survive the loss of all the senses. To interrupt the communication between the sense and the brain, is enough to insure the loss of the sense. The mere compression of the brain, which abolishes the intellection, abolishes all the senses. Far, therefore, from being organs of the intelligence, the organs of the senses are not even organs of the senses, they do not even exercise their functions as organs of the senses, except through the medium of the intelligence, and this intelligence resides only in the brain. The brain alone, therefore, is the organ of the soul;—is it the whole brain—the brain taken _en masse_? Gall thought so, and Spurzheim followed Gall’s opinion; and all the phrenologists who have come after them have followed the examples of Gall and Spurzheim. Yet, after all, it amounts to nothing. If we deprive an animal of its cerebellum, it loses only its locomotive action. If we deprive it of its tubercula quadrigemina, it loses its sight only; if we destroy its medulla oblongata, it loses its respiratory movements, and in consequence thereof, its life.[19] Neither of these parts, therefore, that is to say, the cerebellum, the tubercula quadrigemina, and the medulla oblongata, is the organ of the understanding. The brain, properly so called, is so, and it alone. If we remove from an animal the brain, properly so called, or the hemispheres, it immediately loses its understanding, and loses nothing but its understanding.[20]