I acknowledge, if we were forced to judge by external appearance alone, the ape might be taken for a variety in the human species. The Creator has not formed man's body on a model absolutely different from that of the mere animal; he has comprehended his figure, as well as that of every other animal, under one general plan, but at the same time that he has given him a material form, similar to that of the ape, he infused this animal body with a divine spirit. If he had granted the same favour, not to the ape, but to the meanest animal, whose organization seems to us to be the worst of all constructed beings, this animal would soon have become the rival of man. Quickened by his spirit it would have excelled every other animal, by having the power of thought and speech. Therefore, whatever resemblance there may be between the Hottentot and the ape, the interval which separates them is immense, since the former is endowed with the faculties of thinking and speaking. Who will ever be able to tell in what the organization of an idiot differs from that of another man? yet the defect is certainly in the material organs, since the idiot has a soul like another person. Now, since in mankind, where the whole structure is entirely conformable, and perfectly similar, a difference so trifling as to be entirely imperceptible is sufficient to destroy thought, we must not be astonished that it never appears in the ape, which has not the necessary principle. The action of the soul in general is distinct and independent of matter. But as it has pleased the Divine Author to unite it with the body, the exercise of its particular actions depends on the state of the material organs; and this dependance is not only apparent from the example of idiots but from persons afflicted with delirium, from infants who cannot think, from healthful men when asleep, and from very old people, after the power of thinking is gone. Even the principle of education seems to consist not so much in instructing the mind, or bringing its operation to perfection, as in modifying the material organs, and putting them into the most favourable condition for exercising the thinking principle. Now there are two kinds of educations which should be carefully distinguished, as their effects are quite different; the education of the individual, which is common both to man and the other animals, and that of the species which belongs to man alone. A young animal, as well from incitement as example, learns in a few weeks to perform all the actions of its parents: a child requires a number of years to attain this degree of perfection, because when born its growth and strength is incomparably less forward than in young animals. In the first years the mind is a void relatively to what it becomes in future. A child, therefore, is much slower in receiving individual education than that of the brute; but for this very reason it becomes susceptible of that of the species.