The evidence we shall present in reference to the alternations of forest growths, and the impossibility of accounting for them on any theory of seed-distribution--alternations covering, in many instances, independent forests springing up on a vast scale--and the still wider dispersion of domestic weeds, grasses, forage plants, etc. in localities where they were never known before, will be conclusive, we think, of the correctness of our position, that the Bible Genesis contains _the true key to the mystery of life_. Bear in mind that the true theory of life, whenever it shall be reached in human conception and formulated into definitely-known processes of action, must satisfactorily explain all life-manifestations, as Newton's theory of gravitation accounts for the movements of all celestial bodies. And the simpler the theory when once formulated--the more perfectly it falls into the grooves of definitely-expressed thought, and the more harmoniously it adapts itself to all vital manifestations--the more conclusive must be the induction on which it rests.[3] The emphatic statement that the "primordial germs" of all living things are in the earth, from the lowest infusorial form to the highest vital organism below "specifically-created" man, when supplemented by the scientific statement that "vital units" make their appearance whenever environing conditions favor, is conclusively a theory which accounts for all the life-manifestations heretofore occurring upon our globe. And this theory falls at once into the necessary categories of human thought. Life, as generally defined, is a state of organized being wherein there is functional activity; while a state, or _status_, is an incidence determined by environing conditions. But back of each of these--life and its _status_--there must lie some efficient cause, producing, in the first instance, the environing conditions, and then the functional activity dependent on organization. To assume that this efficient cause is simply the effect or result of organization--one of its dependent conditions--is begging the whole question, and, at the same time, discarding a very important element in the problem--that of conditional environment. What this efficient cause _is_, is a question that awakens no responsive inquiry. It strikes its roots too deeply into the intuitions of consciousness for the soul to give back an intelligible reply. Certain it is that neither metaphysical speculation, nor scientific inquiry, will ever enable us to reach the roots of this question, or extract from them the first quantitive essence of life itself.