and by comparing and examining every living animal in their several parts, that the form of every thing that breathes is nearly the same; that the anatomy of a man and an ape are similar; that every animal has the same organization, the same senses, the same viscera, the same bones, the same flesh, the same motion of the fluids, and the same action in the solids. In all of them he has found a heart, veins, and arteries; the same organs of circulation, respiration, digestion, nutrition, and secretion; the same solid structure, erected with the same materials, and put together nearly in the same manner. This plan he found to proceed uniformly from mankind to the monkey, from the monkey to quadrupeds, from quadrupeds to the cetaceous animals, and so on to birds, fish, and reptiles. This plan, I say, when well comprehended by the human understanding, exhibits a faithful picture of animated nature, and affords the most simple and general view under which she can possibly be considered; and when we extend it by passing from the animal to the vegetable, we shall find this plan, which we at first found varying only by shades, degenerate by degrees from reptiles to insects, from insects to worms, from worms to zoophytes, and from zoophytes to plants; and though changed in all its exterior parts, nevertheless, still preserving the same character; the principal features of which are nutrition, expansion, and reproduction. These features are general and common to every organized substance, they are eternal and divine; and, far from being effaced or destroyed by time, are only renewed and rendered more plain and evident.