The fact is, and it ought to be well known to the closer student of nature, that the fire-weed makes its appearance in the "conditions" of the burnt soil, just as stramonium does in the conditions of the soil where a coal-pit has been recently burned; that is, not from seed, but from "vital units," or germs, everywhere present in the earth--those taking advantage of environing conditions, just as _Bacteria_ or _Torultz_ spring from the proper organic infusions. And the young shoots of stramonium, in a recently burned coal-pit, will be found to spring directly from the surface of the burnt ground, where all seeds and living organism must have perished in the heat, and not at any considerable depth below it. Their first appearance is on the immediate surface of the burnt ground, the same as in the case of fire-weed, and at a time when there were no seeds to be distributed, except such as must have come from the southern hemisphere, or been casually picked up by birds, and taken their slim chances of survival after passing through the natural "gristmills" of the birds. And even this supposition, would only account for the appearance of a single stramonium plant or two, not for a thick bed of it covering the entire ground. The theory of seed-distribution, in this and other cases, is wholly out of the question; as much so as when white clover makes its appearance on a closely-grazed prairie, hundreds of miles away from where there has been a single sprig of clover growing in a thousand years. Every closely observant person, living for any length of time on our western prairies, is familiar with the fact that when the rank and hardier grasses, usually growing thereon, are effectually fed down by stock, and especially by sheep, the prairie grasses disappear, and the ground at once comes in with white clover, and the other nutritious gramma or grasses of our common pasture lands. No seed has been sown in these localities, and none could have been found had every square inch of the surface soil been examined by the most powerful microscope. The white clover and these nutritious grasses make their appearance on these prairies, just as the first sprig of vegetation did on the earth, not from seed, but from preëxisting vital units or primordial germs, implanted therein from the beginning, and awaiting the necessary conditions for their development and growth.