If we survey the wealth of phenomena presented to us by secondary sexual characters, we can hardly fail to be convinced of the truth of the principle of sexual selection. And certainly no one who has accepted natural selection should reject sexual selection, for, not only do the two processes rest upon the same basis, but they merge into one another, so that it is often impossible to say how much of a particular character depends on one and how much on the other form of selection.英文原著 · 《Darwin and Modern Science》
I digress here in order to give an account of the intimate processes, which, according to my view, take place within the germ-plasm, and which I have called "GERMINAL SELECTION." These processes are of importance since they form the roots of variation, which in its turn is the root of natural selection. I cannot here do more than give a brief outline of the theory in order to show how the Darwin-Wallace theory of selection has gained support from it.英文原著 · 《Darwin and Modern Science》
As we have said, this theory of sexual selection takes up a great deal of space in Darwin's book, and it need only be considered here in so far as Darwin applied it to the descent of man. To this latter problem the whole of Part I is devoted, while Part III contains a discussion of sexual selection in relation to man, and a general summary. Part II treats of sexual selection in general, and may be disregarded in our present study. Moreover, many interesting details must necessarily be passed over in what follows, for want of space.英文原著 · 《Darwin and Modern Science》
A full exposition of Sexual Selection appeared in the "The Descent of Man" in 1871, and in the greatly augmented second edition, in 1874. It has been remarked that the two subjects, "The Descent of Man and Selection in Relation to Sex", seem to fuse somewhat imperfectly into the single work of which they form the title. The reason for their association is clearly shown in a letter to Wallace, dated May 28, 1864: "...I suspect that a sort of sexual selection has been the most powerful means of changing the races of man." ("More Letters", II. page 33.)英文原著 · 《Darwin and Modern Science》
By the way, I think, we entirely agree, except perhaps that I use too forcible language about selection. I entirely agree, indeed would almost go further than you when you say that climate (i.e. variability from all unknown causes) is "an active handmaid, influencing its mistress most materially." Indeed, I have never hinted that Natural Selection is "the efficient cause to the exclusion of the other," i.e. variability from Climate, etc. The very term SELECTION implies something, i.e. variation or difference, to be selected...英文原著 · 《The Life and Letters-2》
Use and disuse have here come into play and served to reduce the function to its present rudimentary condition. That these rudimentary organs are rarer in machinery than in animal life is owing to the more prompt action of the human selection as compared with the slower but even surer operation of natural selection. Man may make mistakes; in the long run nature never does so. We have only given an imperfect example, but the intelligent reader will supply himself with illustrations.英文原著 · 《Canterbury Pieces》
But if you really plan on giving billions of dollars to this stock jockey, ask him this, how he's codified the behavioral heuristics at his firm from stock selection to position sizing to market timing to risk management.美剧 · 《Billions》
There seems to be more adverse selection - than we anticipated. - Can we just say it?美剧 · 《Billions》
What the fuck is a 'multi?' Mining a selection of cryptocurrencies with the highest market prices and trading them back for Bitcoin.美剧 · 《Billions》
Desoerate Housewives Season 02 Episode 15 it was a tradition at leonardo's bar and grill, an hour before closing time, a waiter would sing a selection of ridiculously depressing italian arias.美剧 · 《Desperate Housewives》
And what Gruber found was that Darwin had the full theory of natural selection And what Gruber found was that Darwin had the full theory of natural selection演讲 · 《Where good ideas come from ~ Steven Johnson》
I also have a complete selection of your old favourites, those tried and true products we've all come to depend on year in and year out.电影 · 《Edward Scissorhands (1990)》
You'll note the carefully curated selection of sizes, densities, color.电影 · 《Epic (2013)》