The Origin of Species by Means of Natural Selection, Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1911 - 703페이지 |
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235 페이지
... organs , and as we know nothing about the habits and structure of the progenitors of the existing electric fishes , it would be extremely bold to maintain that no serviceable transitions are possible by which these organs might have ...
... organs , and as we know nothing about the habits and structure of the progenitors of the existing electric fishes , it would be extremely bold to maintain that no serviceable transitions are possible by which these organs might have ...
236 페이지
... organs have been developed in each separate group of fishes . The luminous organs which occur in a few insects , belonging to widely different families , and which are situated in different parts of the body , offer , under our present ...
... organs have been developed in each separate group of fishes . The luminous organs which occur in a few insects , belonging to widely different families , and which are situated in different parts of the body , offer , under our present ...
656 페이지
... organs when rendered useless under changed habits or conditions of life ; and we can under- stand on this view the meaning of rudimentary organs . But disuse and selection will generally act on each creature , when it has come to ...
... organs when rendered useless under changed habits or conditions of life ; and we can under- stand on this view the meaning of rudimentary organs . But disuse and selection will generally act on each creature , when it has come to ...
목차
tionCorrelated variationCompensation and economy | 164 |
CHAPTER VI | 207 |
MISCELLANEOUS OBJECTIONS TO THE THEORY OF NATURAL | 262 |
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adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continent crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing extinct extremely facts favourable females fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs paleozoic parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed theory tion trees variability variations varieties vary whilst whole wings young