Here the distinction between different genera and species, and the provision that was made for the perpetuation of different races, are prominently presented; while the production, in the first instance, not of an "infusorial point" or "microscopic monad," but of a living organism capable of multiplying its kind, is expressly declared; and every race is traced up to that primary organism, in perfect consistency with the only law, whether of vegetable or animal reproduction, which is known to be in operation at the present day. And _this_ law of reproduction, so far from being exclusive of a primary act of Creation, seems to presuppose and require it; for there must be a living organism before there can be vital transmission. But the theory of Physiological Development proceeds on a totally different supposition,--a supposition for the truth of which we have not only no historical evidence, but not even the slightest _analogical presumption_, since we have no instance of development anywhere except from a germ or seed, produced by an organism preexisting in a state of maturity. But the exigencies of that theory demand a wide departure from all the familiar lessons of experience; and hence recourse has been had to a series of the wildest and most extravagant conjectures, such as may well justify the opinion of those who have held that the creed of certain philosophers makes a much larger demand on human credulity than that of almost any section of the Christian Church. For, according to that theory, the origin of the FLORA is first accounted for by the action of some element--probably electricity--on a certain _mucus_, which is supposed to be generated at those points where the ocean comes into contact with the earth and air; that is, on the shore of the sea at low water mark. MAILLET had broached the idea of the marine origin of all our present "herbs, plants, roots, and grains,"[39] at a period when the Universal Ocean, of which Leibnitz said so much, was still the creed of some speculative minds; but it has been more recently revived, and exhibited in greater detail, though not with stronger evidence, by some writers of our own age. Thus Dr. Oken tells us that "all life is from the sea;" that "when the sea organism, by self-elevation, succeeds in attaining into form, there issues forth from it a higher organism;" and that "the first organic forms, whether plants or animals, emerged from the shallow parts of the sea." And so the author of "The Vestiges" attempts to show that new races, both of plants and animals, marine and terrestrial, may be accounted for, without any act of immediate creation, by a change or transmutation of species resulting from the agency of natural causes. "There is," as he tells us, "another set of phenomena presented in the course of our history; the coming into existence, namely, of a long suite of living things, vegetable and animal, terminating in the families which we still see occupying the surface.