The day that his mother was brought to bed of him and his soul, there were born in the house a dog, a cat, and a canary bird. At the end of eighteen months I make the dog an excellent hunter; in a year the canary bird whistles an air; in six weeks the cat is master of its profession; and the child, at the end of four years, does nothing. I, a gross person, witnessing this prodigious difference, and never having seen a child, think at first that the cat, the dog, and the canary are very intelligent creatures, and that the infant is an automaton. However, by little and little, I perceive that this child has ideas and memory, that he has the same passions as these animals; and then I acknowledge that he is, like them, a rational creature. He communicates to me different ideas by some words which he has learned, in like manner as my dog, by diversified cries, makes known to me exactly his different wants. I perceive at the age of six or seven years the child combines in his little brain almost as many ideas as my hound in his; and at length, as he grows older, he acquires an infinite variety of knowledge. Then what am I to think of him? Shall I believe that he is of a nature altogether different? Undoubtedly not; for you see on one hand an idiot, and on the other a Newton; yet you assert that they are of one and the same nature--that there is no difference but that of greater and less. The better to assure myself of the verisimilitude of my probable opinion, I examine the dog and the child both waking and sleeping--I have them each bled immediately; then their ideas seem to escape with their blood. In this state I call them--they do not answer; and if I draw from them a few more ounces, my two machines, which before had ideas in great plenty and passions of every kind, have no longer any feeling. I next examine my two animals while they sleep; I perceive that the dog, after eating too much, has dreams; he hunts and cries after the game; my youngster, in the same state, talks to his mistress and makes love in his dreams. If both have eaten moderately, I observe that neither of them dream; in short, I see that the faculties of feeling, perceiving, and expressing their ideas unfold themselves gradually, and also become weaker by degrees. I discover many more affinities between them than between any man of strong mind and one absolutely imbecile. What opinion then shall I entertain of their nature? That which every people at first imagined, before Egyptian policy asserted the spirituality, the immortality, of the soul. I shall even suspect that Archimedes and a mole are but different varieties of the same species--as an oak and a grain of mustard are formed by the same principles, though the one is a large tree and the other the seed of a small plant. I shall believe that God has given portions of intelligence to portions of matter organized for thinking; I shall believe that matter has sensations in proportion to the fineness of its senses, that