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Sexual selection goes hand in hand with natural selection. From the very first I have regarded sexual selection as affording an extremely important and interesting corroboration of natural selection, but, singularly enough, it is precisely against this theory that an adverse judgment has been pronounced in so many quarters, and it is only quite recently, and probably in proportion as the wealth of facts in proof of it penetrates into a wider circle, that we seem to be approaching a more general recognition of this side of the problem of adaptations. Thus Darwin's words in his preface to the second edition (1874) of his book, _The Descent of Man and Sexual Selection_, are being justified: "My conviction as to the operation of natural selection remains unshaken," and further, "If naturalists were to become more familiar with the idea of sexual selection, it would, I think, be accepted to a much greater extent, and already it is fully and favourably accepted by many competent judges." Darwin was able to speak thus because he was already acquainted with an immense mass of facts, which, taken together, yield overwhelming evidence of the validity of the principle of sexual selection.

Without taking into account insects and such other "small deer,"--to quote Shakespeare's expression,--this fundamental principle of population will become at once apparent if we examine merely familiar instances of back-boned or vertebrate animals. The lowest vertebrates are clearly the fishes: and the true fishes have almost invariably gigantic families. A single cod, for example, is said to produce, roughly speaking, nine million eggs at a birth (I cannot pretend I have checked this calculation); but supposing they were only a million, and that one-tenth of those eggs alone ever came to maturity, there would still be a hundred thousand codfish in the sea this year for every pair that swam in it last year: and these would increase to a hundred thousand times that number next year; and so on, till in four or five years' time the whole sea would be but one solid mass of closely-packed cod-banks. We can see for ourselves that nothing of the sort actually occurs--practically speaking, there are about the same number of cod one year as another. In spite of this enormous birth-rate, therefore, the cod population is not increasing--it is at a standstill. What does that imply? Why, that taking one brood and one year with another, only a pair of cod, roughly speaking, survive to maturity out of each eight or nine million eggs. The mother cod lays its millions, in order that two may arrive at the period of spawning. All the rest get devoured as eggs, or snapped up as young fry, or else die of starvation, or are otherwise unaccounted for. It seems to us a wasteful way of replenishing the earth: but it is nature's way; we can only bow respectfully to her final decision.

Moreover, the Spaniards found their first American conquests too easy, and the rewards of these too great. This prevented all thought of developing the country through industry, concentrating expectation solely upon waiting fortunes, to be had from the natives by the sword or through forced labor in mines, Their treatment of the aborigines was nothing short of diabolical. Well has it been said: "The Spaniards had sown desolation, havoc, and misery in and around their track. They had depopulated some of the best peopled of the islands and renewed them with victims deported from others. They had inflicted upon hundreds of thousands of the natives all the forms and agonies of fiendish cruelty, driving them to self-starvation and suicide, as a way of mercy and release from an utterly wretched existence. They had come to be viewed by their victims as fiends of hate, malignity, and all dark and cruel desperation and mercilessness in passion. The hell which they denounced upon their victims was shorn of its worst terror by the assurance that these tormentors were not to be there. Las Casas, the noble missionary, the true soldier of the cross, and the few priests and monks who sympathized with him, in vain protested against these cruelties."

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