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Updated: May 8, 2025
The theory of natural selection is grounded on the belief that each new variety, and ultimately each new species, is produced and maintained by having some advantage over those with which it comes into competition; and the consequent extinction of less-favoured forms almost inevitably follows.
The two first heads shall be here discussed Instinct and Hybridism in separate chapters. As natural selection acts solely by the preservation of profitable modifications, each new form will tend in a fully-stocked country to take the place of, and finally to exterminate, its own less improved parent or other less-favoured forms with which it comes into competition.
Eric Marshall, tall, broad-shouldered, sinewy, walking with a free, easy stride, which was somehow suggestive of reserve strength and power, was one of those men regarding whom less-favoured mortals are tempted seriously to wonder why all the gifts of fortune should be showered on one individual.
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