The truth is, that all classification whatever, when we examine its _raison d'etre_ closely, is found to be arbitrary--to depend on our sense of our own convenience, and not on any inherent distinction in the nature of the things themselves. Strictly speaking, there is only one thing and one action. The universe, or God, and the action of the universe as a whole. Lastly, I may predict with some certainty that before long we shall find the original Darwinism of Dr. Erasmus Darwin (with an infusion of Professor Hering into the bargain) generally accepted instead of the neo- Darwinism of to-day, and that the variations whose accumulation results in species will be recognised as due to the wants and endeavours of the living forms in which they appear, instead of being ascribed to chance, or, in other words, to unknown causes, as by Mr. Charles Darwin's system. We shall have some idyllic young naturalists bringing up Dr. Erasmus Darwin's note on _Trapa natans_ {221} and Lamarck's kindred passage on the descent of _Ranunculus hederaceus_ from _Ranunculus aquatilis_ {222a} as fresh discoveries, and be told with much happy simplicity, that those animals and plants which have felt the need of such a structure have developed it, while those which have not wanted it have gone without it. Thus it will be declared, every leaf we see around us, every structure of the minutest insect, will bear witness to the truth of the "great guess" of the greatest of naturalists concerning the memory of living matter. {222b} I dare say the public will not object to this, and am very sure that none of the admirers of Mr. Charles Darwin or Mr. Wallace will protest against it; but it may be as well to point out that this was not the view of the matter taken by Mr. Wallace in 1858 when he and Mr. Darwin first came forward as preachers of natural selection. At that time Mr. Wallace saw clearly enough the difference between the theory of "natural selection" and that of Lamarck. He wrote:--