Prior to and simultaneous with the formation of cells went on the production of crystals and the mineral as well as the vegetable kingdoms were further and further developed. Contemporary with the first plant-cells the conditions were plainly offered for the formation of the first life-cells. And now the question arises, What is life? Whence comes it? Although it is certain that in the process of development of the earth after its separation from the sun no life was present. "It is asserted that life is motion and is an attribute of matter; yet that is something wholly different from what is understood by the term. Thus far science has pointed out no distinction between dead and living protoplasm, and the affirmation that the primordial cells are the source of life is not tenable, since the cell is an organization that presupposes life, and so, at most, the original cell could be designated as but the first expression of life. For a short time it was assumed that life came to the earth through meteors or parts of worlds that had gone to pieces, but this idea was soon given up, because neither the manifold nature of life nor the origin of the same could thereby be explained or determined, and thus the question was only pushed farther back, since what was desired to be known, was, how life originated on the world that was destroyed. "When, and under what circumstances, life began on the earth can not be accurately fixed, yet it is clear that at the time when the ocean still covered nearly all the earth and was so hot that not a single one of the now existing plants and living beings could then exist, the life in that ocean and on its bottom was so infinitely grand in its proportions that men can now form no adequate conception of the same. The force of growth as well as of decay was immense, and all that was grown or made by its decay only increased the mass of life-producing substance. "There are three theories as to the origin of living beings: "1. God made all animals, including man, in pairs and of full size. "2. The elements of physical nature and the forces dwelling in matter by a lucky arrangement of atoms developing living organs out of matter. "3. An intelligent, intellectual force permeates matter, and wherever this in its development attains the conditions for the maintenance of life (and so a higher manifestation of force than in the mineral) it brings forth the intellectual life in the protoplasmic germ for the finest organism. Through the laws of inheritance, of change, of the multiplication of progressive development, of natural selection and of the persistence of the most gifted individuals, living beings are developed through all classes and species up to man.