The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for Life |
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Page 83
... quadrupeds , be let to grow , the more vigorous plants gradually kill the less vigorous , though fully grown plants ; thus out of twenty species growing on a little plot of mown turf ( three feet CHAP . III . ] NATURE OF THE CHECKS TO ...
... quadrupeds , be let to grow , the more vigorous plants gradually kill the less vigorous , though fully grown plants ; thus out of twenty species growing on a little plot of mown turf ( three feet CHAP . III . ] NATURE OF THE CHECKS TO ...
Page 92
... quadrupeds . But the struggle will almost invariably be most severe between the individuals of the same species , for they frequent the same districts , require the same food , and are ex- posed to the same dangers . In the case of ...
... quadrupeds . But the struggle will almost invariably be most severe between the individuals of the same species , for they frequent the same districts , require the same food , and are ex- posed to the same dangers . In the case of ...
Page 166
... quadrupeds . Instances could be given of similar varieties being produced from the same species under external condi- tions of life as different as can well be conceived ; and , on the other hand , of dissimilar varieties being produced ...
... quadrupeds . Instances could be given of similar varieties being produced from the same species under external condi- tions of life as different as can well be conceived ; and , on the other hand , of dissimilar varieties being produced ...
Page 168
... quadrupeds . We may believe that the progenitor of the ostrich genus had habits like those of the bustard , and that , as the size and weight of its body were in- creased during successive generations , its legs were used more , and its ...
... quadrupeds . We may believe that the progenitor of the ostrich genus had habits like those of the bustard , and that , as the size and weight of its body were in- creased during successive generations , its legs were used more , and its ...
Page 240
... quadrupeds , and by being fur- nished with wings and plumes , as different in shape as they are elegant in structure , so as to be wafted by every breeze . I will give one other instance ; for this subject of the same end being gained ...
... quadrupeds , and by being fur- nished with wings and plumes , as different in shape as they are elegant in structure , so as to be wafted by every breeze . I will give one other instance ; for this subject of the same end being gained ...
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Common terms and phrases
adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young