The book of Nature is the book of Fate. She turns the gigantic pages,—leaf after leaf,—never re-turning one. One leaf she lays down, a floor of granite; then a thousand ages, and a bed of slate; a thousand ages, and a measure of coal; a thousand ages, and a layer of marl and mud: vegetable forms appear; her first misshapen animals, zoophyte, trilobium, fish; then, saurians,—rude forms, in which she has only blocked her future statue, concealing under these unwieldly monsters the fine type of her coming king. The face of the planet cools and dries, the races meliorate, and man is born. But when a race has lived its term, it comes no more again. The population of the world is a conditional population; not the best, but the best that could live now; and the scale of tribes, and the steadiness with which victory adheres to one tribe, and defeat to another, is as uniform as the superposition of strata. We know in history what weight belongs to race. We see the English, French, and Germans planting themselves on every shore and market of America and Australia, and monopolizing the commerce of these countries. We like the nervous and victorious habit of our own branch of the family. We follow the step of the Jew, of the Indian, of the Negro. We see how much will has been expended to extinguish the Jew, in vain. Look at the unpalatable conclusions of Knox, in his "Fragment of Races,"—a rash and unsatisfactory writer, but charged with pungent and unforgetable truths. "Nature respects race, and not hybrids." "Every race has its own _habitat_." "Detach a colony from the race, and it deteriorates to the crab." See the shades of the picture. The German and Irish millions, like the Negro, have a great deal of guano in their destiny. They are ferried over the Atlantic, and carted over America, to ditch and to drudge, to make corn cheap, and then to lie down prematurely to make a spot of green grass on the prairie. One more fagot of these adamantine bandages, is, the new science of Statistics. It is a rule, that the most casual and extraordinary events—if the basis of population is broad enough—become matter of fixed calculation. It would not be safe to say when a captain like Bonaparte, a singer like Jenny Lind, or a navigator like Bowditch, would be born in Boston: but, on a population of twenty or two hundred millions, something like accuracy may be had.¹ ¹ "Everything which pertains to the human species, considered as a whole, belongs to the order of physical facts. The greater the number of individuals, the more does the influence of the individual will disappear, leaving predominance to a series of general facts dependent on causes by which society exists, and is preserved."—QUETELET.