"1. The first productions of this power in the oldest Neptunian strata of the earth consisted of Plants, Zoophytes, Mollusks, Crustaceans, and perhaps even Fish; the simultaneous appearance of which, therefore, contradicts the assumption that the more perfect organic forms arose out of the gradual transformation in time of the more imperfect forms.

"2. The same power which produced the first organic forms has continued to operate in intensively as well as extensively increasing activity during the whole subsequent geological period, up to the final appearance of man; but here also can no traces be found of a gradual transformation of old species and genera into new; but the new have every where appeared as new without the co-operation of the former.

"3. In the succession of the different forms of plants and animals, a certain regular course and plan is perceptible, which is quite independent of chance. While all species possess only a limited duration, and must sooner or later disappear, they make way for subsequent new ones, which not only almost always offer an equivalent, in number, organization, and duties to be performed, for those which have disappeared, but which are also generally more varied, and therefore more perfect, and always maintain an equilibrium with each other in their stage of organization, their mode of life, and functions. There always exists, therefore, a certain fixed relation between the newly arising and the disappearing forms of organic life.

"4. A similar relation necessarily exists between the newly arising organic forms and the outward conditions of life which prevailed at their first appearance on the earth's surface, or at the place of their appearance.

"5. A fixed plan appears to be the basis of the whole series of development of organic forms, in so far as man makes his first appearance at its close, when he finds every thing prepared that is necessary to his own existence and to his progressive development and improvement—which would not have been possible had he appeared at a former period.

"6. Such a regular progress in carrying out the same plan from the beginning to the end of a period of millions of years can only be accounted for in one of two ways. Either this course of successive development during millions of years has been the regular immediate result of the systematic action of a conscious Creator, who on every occasion settled and carried out not only the order of appearance, formation, organization, and terrestrial object of each of the countless numbers of species of plants and animals, but also the number of the first individuals, the place of their settlement in every instance, although it was in his power to create every thing at once—or there existed some natural power hitherto entirely unknown to us, which by means of its own laws formed the species of plants and animals, and arranged and regulated all those countless individual conditions; which power, however, must in this case have stood in the most immediate connection with, and in perfect subordination to, those powers which caused the gradually progressing perfection of the crust of the earth, and the gradual development of the outward conditions of life for the constantly increasing numbers and higher classes of organic forms in consequence of this perfection. Only in this way can we explain how the development of the organic world could have regularly kept pace with that of the inorganic. Such a power, although we know it not, would not only be in perfect accordance with all the other functions of nature, but the Creator, who regulated the development of organic nature by means of such a force so implanted in it, as he guides that of the inorganic world by the mere co-operation of attraction and affinity, must appear to us more exalted and imposing than if we assumed that he must always be giving the same care to the introduction and change of the vegetable and animal world on the surface of the earth as a gardener daily bestows on each individual plant in the arrangement of his garden.

"7. We therefore believe that all species of plants and animals were originally produced by some natural power unknown to us, and not by transformation from a few original forms, and that that power was in the closest and most necessary connection with those powers and circumstances which effected the perfection of the earth's surface."

Barrande also, probably the greatest living palæontologist of Europe, adheres substantially to these views; as Agassiz did, and I believe Hall and Dana still do, in America.

I have, for my own part, seen no reason to dissent from these views, though in the sequel I shall endeavor to present some considerations which may tend to reconcile with them some of the hypotheses of a contrary nature now held. It must be admitted, however, that the majority of geologists and biologists have abandoned these views of Pictet and Bronn, and have gone over to the evolutionist philosophy, with how little reason I have endeavored to show elsewhere, [147] and shall farther illustrate in the Appendix. Let it be observed, however, that even evolution does not affect the grand idea of the unity of nature, or the fact that the plan of the Creator in the organic world was so vast that it required the whole duration of our planet, in all its stages of physical existence, to embrace the whole. There is but one system of organic nature; but, to exhibit the whole of it, not only all the climates and conditions now existing are required, but those also of all past geological periods. Further, the progress of nature being mainly in the direction of differentiation of functions once combined, it has a limit backward in the most general forms and conditions, and forward in the most specialized. This is the history of the individual and probably also of the type, of the world itself and of the universe; and for this reason material nature necessarily lacks the eternity of its author.

It appears, from the above facts and reasonings, that geology informs us—1. That the materials of our existing continents are of secondary origin, as distinguished from primitive or coeval with the beginning. 2. That a chronological order of formation of these rocks can be made out. 3. That the fossil remains contained in the rocks constitute a chronology of animal and vegetable existence. 4. That the history of the earth may be divided in this way into distinct periods, all pre-Adamite. 5. That the pre-Adamite periods were of enormous duration. 6. That during these periods the existing general laws of nature were in force, though the dispositions of inorganic nature were different in different periods, and the animals and plants of successive periods were also different from each other. 7. The introduction of new species of animals and of plants, while indicating advance in the perfection of nature, does not prove spontaneous development, but rather a definite plan and law of creation.