Our physical science, which is becoming the dominant culture of thousands, and which is beginning to permeate our common literature to an extent which few watch enough, quite tends the same way. The two peculiarities are its homeliness and its inquisitiveness; its value for the most "stupid" facts, as one used to call them, and its incessant wish for verification--to be sure, by tiresome seeing and hearing, that they are facts. The old excitement of thought has half died out, or rather it is diffused in quiet pleasure over a life instead of being concentrated in intense and eager spasms. An old philosopher--a Descartes, suppose--fancied that out of primitive truths, which he could by ardent excogitation know, he might by pure deduction evolve the entire universe. Intense self-examination, and intense reason would, he thought, make out everything. The soul "itself by itself," could tell all it wanted if it would be true to its sublimer isolation. The greatest enjoyment possible to man was that which this philosophy promises its votaries--the pleasure of being always right, and always reasoning--without ever being bound to look at anything. But our most ambitious schemes of philosophy now start quite differently. Mr. Darwin begins:-- "When on board H.M.S. Beagle, as naturalist, I was much struck with certain facts in the distribution of the organic beings inhabiting South America, and in the geological relations of the present to the past inhabitants of that continent. These facts, as will be seen in the latter chapters of this volume, seemed to throw some light on the origin of species--that mystery of mysteries, as it has been called by one of our greatest philosophers. On my return home, it occurred to me, in 1837, that something might perhaps be made out on this question by patiently accumulating and reflecting on all sorts of facts which could possibly have any bearing on it. After five years' work I allowed myself to speculate on the subject, and drew up some short notes; these I enlarged in 1844 into a sketch of the conclusions which then seemed to me probable: from that period to the present day I have steadily pursued the same object. I hope that I may be excused for entering on these personal details, as I give them to show that I have not been hasty in coming to a decision."