In proof of this statement, we might instance any number of cases where recently abandoned brick-yards and other clayey excavations, were situated at considerable distances from any natural water-courses, or fish-stocked ponds, from which spawn could have been derived, and yet these excavations have no sooner been filled with permanently standing rain water, than certain small fishes of the _Cyprinidae_ and other families, have made their appearance therein.[30] Nobody has thought of stocking these standing pools of water with the fish in question, nor has there been any surface overflow to account for their presence, nor any other apparent means of transportation, if we except the fish-catching birds, and they generally swallow their food in the water or on the nearest tree to the point of capture. Any theory accounting for the presence of spawn is, therefore, out of the question. This spawn must have traversed hard clay deposits for the distance of half a mile or more to make their appearance in these waters. The only possible explanation of this class of phenomena, and they are by no means infrequent, is to be found in "favoring conditions" and the "presence of vital units." They are primordial manifestations of life, and such as would have made their appearance in any corresponding latitude of the southern hemisphere, under the same favoring conditions. And this is true of all living organisms from the lowest morphological cell, in the ichthyologic world, to the highest and lordliest conifer that grows. Their spawn and seeds are perishable by heat, but the vital principle that organizes them is as imperishable in one element as another. No seven-times heated furnace, much less the experimental flasks of the physicist, will affect a vital principle of nature any more than a May-morning puff of the east wind would shake Olympus. And all the countless myriads of vital units in nature are now manifesting themselves in animal and vegetal forms, under favoring conditions, the same as in those far-distant epochs of the world's history when a more exuberant vegetation prevailed, if not a more abounding animal life. The same persistent, ever-acting law of vital development and growth has been present, in all conditions and circumstances of matter, ever since the detritus of the silicious rocks felt the first influence of the rains, the dews, and the sunlight. Then the earth commenced "to bring forth the grass, the herb yielding seed, and the fruit-trees yielding fruit, after his kind;" and in their growth was laid the foundation of animal life. Whether there was any audible or inaudible command of God uttered at the time, is not the question. It is the _fact_ of vital growth that we are after, and not the command. The geologic records attest the fact, as well as the ever-acting vital law; and it is enough for us to know, with sturdy old Richard Hooker, that all law--and especially all _vital_ law--"has her