On the Origin of Species by Means of Natural Selection: Or the Preservation of Favoured Races in the Struggle for Life |
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Page 55
... increase . Every being , which during its natural lifetime produces several eggs or seeds , must suffer destruction during some period of its life , and during some season or occasional year , otherwise , on the principle of geometrical ...
... increase . Every being , which during its natural lifetime produces several eggs or seeds , must suffer destruction during some period of its life , and during some season or occasional year , otherwise , on the principle of geometrical ...
Page 56
... increase of various animals in a state of nature when circumstances have been favourable to them during two or three following seasons . Still more striking is the evidence from our domestic animals of many kinds which have run wild in ...
... increase of various animals in a state of nature when circumstances have been favourable to them during two or three following seasons . Still more striking is the evidence from our domestic animals of many kinds which have run wild in ...
Page 98
... increase , and the breeds to diverge in character both from each other and from their common parent . But how , it may be asked , can any analogous principle apply in nature ? I believe it can and does apply most efficiently , from the ...
... increase , and the breeds to diverge in character both from each other and from their common parent . But how , it may be asked , can any analogous principle apply in nature ? I believe it can and does apply most efficiently , from the ...
Contents
INTRODUCTION | 1 |
STRUGGLE FOR EXISTENCE | 52 |
NATURAL SELECTION | 69 |
Copyright | |
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Common terms and phrases
accumulated adapted affinities allied species amount analogous ancient appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distant distinct species divergence doubt embryo Europe existing exterminated extinct extremely facts favourable fertility flowers formation forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important increase in number individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner migration modification modified descendants natural selection naturalists nearly nest occasional oceanic islands offspring Origin of Species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemblance seeds sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory tion trees variability variation vary whole widely