Descartes said that the idea that animals think and feel is a relic of childhood. The idea that they do _not_ think and feel might be more truly called a relic of that darkest side of perverse childhood, the existence of which we are all fain to forget. Whoever has seen a little child throwing stones at a toad on the highway—and sad because his hands are too small to take up the bigger stones to throw—will understand what I mean. I do not wish to allude more than slightly to a point which is of too much importance to pass over in silence. Descartes was a vivisector: so were the pious people at Port Royal who embraced his teaching with enthusiasm, and liked to hear the howls of the dogs they vivisected. M. Émile Ferrière, in his work “L’âme est la fonction du cerveau,” sees in the “souls” of beasts exactly the same nature as in the “soul” of man; the difference, he maintains, is one of degree; though generally inferior, it is sometimes superior to “souls” of certain human groups. Here is a candid materialist who deserves respect. But there is a school of physiologists nowadays which carries on an unflagging campaign in favour of belief in unconscious animal machines which work by springs, while denying that there is a God to wind up the springs, and in conscious human machines, while denying that there is a soul, independent of matter, which might account for the difference. “The wish is father to the thought.” _Non ragionam di lor ma guarda e passa._ The strongest of all reasons for dismissing the machine theory of animals is their variety of idiosyncrasy. It is said that to the shepherd no two sheep look alike; it is certain that no two animals of any kind have the same characters. Some are selfish, some are unselfish, some are gentle, some irretrievably ill-tempered both to each other and to man. Some animals do not show much regret at the loss of their offspring, with others it is manifestly the reverse. Édouard Quinet described how on one occasion, when visiting the lions’ cage in the Jardin des Plantes, he observed the lion gently place his large paw on the forehead of the lioness, and so they remained, grave and still, all the time he was there. He asked Geoffroy Saint-Hilaire, who was with him, what it meant. “Their lion cub,” was the answer, “died this morning.” “Pity, benevolence, sympathy, could be read on those rugged faces.” That these qualities are often absent in sentient beings what man can doubt? But they are not to be found in the best mechanical animals in all Nuremberg!