is a line of division which such agencies alone can not cross? Do they not clearly point to the exercise of the creative power in a special manner, and for special purposes? That power being once exercised, the new chemical composition and mechanical appliances being devised, the same "ideal plan" could be carried through a new class of animals by a repetition which is in accordance with the economy of Nature, and which an infinite power could adapt to the formation of animals, each of which was designed to perpetuate its own species and no other. Hence we should expect to find in the animals sharing in the same formation of the blood and the vascular system a corresponding process of healing the parts severed by a wound, and a continuous secretion from such vessels as have not been cut away; but we should not expect to find the stumps growing into a new and perfect part, to take the place of what has been removed by amputation.[55] We should expect to find the same drugs affecting different animals of the same class alike; and when the nervous system of a class of animals is upon the same general plan, we should expect to find them similarly affected by stimulants. But these resemblances do not militate very strongly against the hypothesis of special creations, when we consider that it is according to the universal economy of the Omnipotent Creator to employ the necessary, and no more than the necessary, power in originating a plan that may be applied to the formation of a distinct class of beings, and that his adaptations of this plan to further and specific constructions of beings belonging to a general class, but differing widely from each other, are among the strongest and plainest proofs of his infinite power and the nature of his methods.