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 130
... developed , unless it be unusually developed in comparison with the same part in closely allied species . Thus , the bat's wing is a most abnormal structure in the class mammalia ; but the rule would not here apply , because there is a ...
... developed , unless it be unusually developed in comparison with the same part in closely allied species . Thus , the bat's wing is a most abnormal structure in the class mammalia ; but the rule would not here apply , because there is a ...
Page 146
... developed to an extra- ordinary size or in an extraordinary manner , in com- parison with the same part or organ in the allied species , must have gone through an extraordinary amount of modification since the genus arose ; and thus we ...
... developed to an extra- ordinary size or in an extraordinary manner , in com- parison with the same part or organ in the allied species , must have gone through an extraordinary amount of modification since the genus arose ; and thus we ...
Page 157
... developed at an early period in great numbers and under any subordinate forms . Thus , to return to our imaginary illustration of the flying - fish , it does not seem probable that fishes capable of true flight would have been developed ...
... developed at an early period in great numbers and under any subordinate forms . Thus , to return to our imaginary illustration of the flying - fish , it does not seem probable that fishes capable of true flight would have been developed ...
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