All that the materialists can claim respecting man's agency in the production of life is, that he may take advantage of the uniform laws of nature, so far as they are known to him, planting seeds here, changing chemical conditions there, using different infusions in his experimental flasks,--organic or inorganic, as he may choose--and then await the action of these uniform laws. He will find them operative everywhere, and if he studies them deeply enough, he will find that they are not so much the laws of nature as they are the laws of nature's God. Professor Bastian thinks he has conclusive evidence that what he calls "new-born specks of living matter" are produced _de novo_, that is, independently of any conceivable germ or germinal principle of life implanted in nature. But he confounds this implanted principle of life with the living organism it produces. His morphological cells, as well as plastide particles, are among these living organisms, as is conclusively shown by his own experiments. These all perish in his super-heated flasks. But the vital principle that produced them--that which becomes germinal under the proper conditional incidences--he can no more destroy by experimentation than he can create a new world or annihilate the old one. His flask experiments, therefore, prove nothing; and all this talk about _de novo_ production is the sheerest scientific delusion. For, were it possible to destroy every plant, tree, shrub, blade of grass, weed, seed, underground root, nut, and tuber to-day, the earth would teem with just as diversified a vegetation as ever to-morrow. A few trees, like the gigantic conifers of the Pacific slope, might not make their appearance again, and some plants might drop out of the local flora; but the _Pater omnipotens Æther_ of Virgil, would descend into the bosom of his joyous spouse (the earth), and, great himself, mingle with her great body, in all the prodigality, profusion, and wealth of vegetation as before.[27]