26. At the corporeal and purely anatomical point of view, man belongs to the mammals, from which he differs only slightly in outward form. Beyond that he is of the same chemical composition as all animals, has the same organs, functions, modes of nutrition, respiration, secretion, and reproduction. He is born, lives, and dies in the same conditions; and at his death his body is decomposed like that of all other beings. There is not in his blood, flesh, or bone, an element more or less than in those of the lower animals. Like the latter, in dying he renders to the Earth oxygen, hydrogen, nitrogen, and carbon, which were combined in order to form him, and go towards forming new combinations, new mineral, vegetable, and animal bodies. The analogy is so perfect that man can study his own organic functions in certain animals when experiments cannot be made with himself.