In modern times, very few philosophers have ventured to solve the whole problem of the universe by any self-acting, self-producing power in nature. La Place limited himself to the mode in which the great bodies of the universe were produced by the vertical movements of nebulous matter; although his object, equally with that of Democritus and Epicurus, was to dispense with an intelligent, personal Deity. Lamarck, Geoffrey St. Hilaire, and Bory St. Vincent, assuming the existence of matter and its laws, have endeavored to show, by the inherent vitality of some parts of matter, how the first or lowest classes of animals and plants may have been produced; and how, from these, by the theory of development and the force of circumstances, all the higher families, with their instincts and intellects, may have been evolved. A still more recent, but anonymous, writer has had the boldness to unite these nebular hypotheses, with those of spontaneous generation and transmutation, into a single system, and to attempt to clothe it with the garb of philosophy; nay, to do this in consistency, not only with Theism, but with a belief in revelation. This theory is what I denominate the _hypothesis of creation by law_. And judging from its wide reception, we should be led to infer that it had strong probabilities in its favor. It should, therefore, at least receive a careful and candid examination. For though many of its statements and conclusions are absurd, and some of them are highly ridiculous, the hypothesis, at least in some of its parts, falls in with certain loose notions that have got possession of the public mind, and which nothing but cogent reasoning can eradicate. Before entering upon such an examination, however, it seems necessary to go somewhat more into detail in illustration of the nature of this hypothesis. It may conveniently be described under the heads of _cosmogony_, which attempts to account for the origin of the world; _zoogony_, which explains the origin of animals; and _zoonomy_, which describes the laws of animal life.[17]