But the idea that nature has any cunning devices by which she may hide seeds away where they will remain "almost imperishable" for ages, is not entirely new with Professor Marsh, nor is it any suggestion that would be protected by copyright. In finding the winds, birds, quadrupeds, and other assumed agencies of distribution improbable, he seeks, with Dr. Dwight, for "the seeds of an ancient vegetation," and, finding none by actual observation, concludes that nature has some occult, and thoroughly surreptitious, method of hiding them away, even in soils below the last glacial drift, where no microscope can possibly reach them. As the accounts of seeds taken from the mummy-cases of Egypt may answer the purposes of those seeking to palm off some new cereal as a nine-days wonder on the ignorant, so these speculations about the indestructibility of seeds, when hidden away by nature, may answer a like purpose in imposing upon the over-credulous; but they will hardly be accepted by the intelligent, much less the scientific, in the light of all the facts herein given. The simple truth is that all seeds are speedily perishable by out-door exposure. We hardly know a single seed that will survive beyond the second year when subjected to such exposure. If they do not germinate the first year, their vitality is utterly gone the second year, as hopelessly so as if they had been cast into the fire and consumed to ashes.
But there is a large class of vegetable phenomena which wholly excludes the idea of this wonderful vitality of seeds. It is well known that soil brought up from deep wells and other excavations, often produces plants entirely unlike the prevailing local flora. This soil has been brought up, in many instances, from beneath the last glacial drift, where it must have remained for not less than a quarter of a million years at the lowest calculation, and may have remained for millions of years, if not longer; and yet the same singular phenomenon is presented. Exposed to the sun's rays, and the fructifying influences of showers and dews, the soil burgeons forth into an independent flora, and such as are nowhere to be found in the surrounding locality. The writer, in digging a well in Waukesha, Wis.,--a place now famous for the curative properties of its waters--in 1847, struck soil at a depth of about thirty-five feet--that which was evidently ante-glacial. The place is some twenty miles back from Milwaukee, and the whole section, far into the interior of the state from Lake Michigan, is one of drift, covering the primeval soil at various depths, from a few feet up to a hundred or more; and the imbedded soil must have remained in its place for untold ages. And yet, it was no sooner brought to the surface than it produced several small plants that were wholly unlike the prevailing local flora; although, unfortunately, they did not sufficiently mature to enable us to determine their genera and species. Considerable portions of this soil were dried and subjected by us, and the late Dr. John A. Savage, then president of Carroll College, to microscopic examination, but without discovering the slightest trace of any seed, or anything resembling seed, in the several portions carefully examined. The soil, however, contained, in its imbedded place, several large Norway spruce logs, in a more or less perfect state of preservation. But there were no cones, nor chits to cones, to be found in it, although the most rigid examination was made at the time to discover them. That the seeds of these delicate little plants should have survived the wreck of this ancient Norwegian forest, or the drift from one, and burst forth into newness of life after hundreds of thousands, not to say millions of years, is decidedly too large a draft upon our credulity to be honored "without sight." But we will return to the alternations of forest growths.