Contributions to the Theory of Natural Selection

Cover Contributions to the Theory of Natural Selection
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All the swiftest animals--deer, antelopes, hares, foxes, lions, leopards, horses, zebras, and many others, have reachedvery nearly the same degree of speed. Although the swiftest of each musthave been for ages preserved, and the slowest must have perished, wehave no reason to believe there is any advance of speed. The possiblelimit under existing conditions, and perhaps under possible terrestrialconditions, has been long ago reached. In cases, however, where thislimit had not been so nearly rea...ched as in the horse, we have beenenabled to make a more marked advance and to produce a greaterdifference of form. The wild dog is an animal that hunts much incompany, and trusts more to endurance than to speed. Man has producedthe greyhound, which differs much more from the wolf or the dingo thanthe racer does from the wild Arabian. Domestic dogs, again, have variedmore in size and in form than the whole family of Canid

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