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 vii
... stages of useful structures - Causes which interfere with the acquisition through natural selection of useful structures - Gradations of structure with changed functions - Widely different organs in members of the same class , developed ...
... stages of useful structures - Causes which interfere with the acquisition through natural selection of useful structures - Gradations of structure with changed functions - Widely different organs in members of the same class , developed ...
Page xii
... stages of useful structures . There is also a discussion on the causes which prevent in many cases the acquisition through natural selection of useful structures . Lastly , reasons are given for dis- believing in great and sudden ...
... stages of useful structures . There is also a discussion on the causes which prevent in many cases the acquisition through natural selection of useful structures . Lastly , reasons are given for dis- believing in great and sudden ...
Page 10
... stage . But hereditary diseases and some other facts make me believe that the rule has a wider extension , and that , when there is no apparent reason why a peculiarity should appear at any particular age , yet that it does tend to ...
... stage . But hereditary diseases and some other facts make me believe that the rule has a wider extension , and that , when there is no apparent reason why a peculiarity should appear at any particular age , yet that it does tend to ...
Page 26
... stages through which they have insensibly passed , and come to differ so greatly from the rock - pigeon . Youatt gives an excellent illustration of the effects of a course of selection , which may be considered as unconscious , in so ...
... stages through which they have insensibly passed , and come to differ so greatly from the rock - pigeon . Youatt gives an excellent illustration of the effects of a course of selection , which may be considered as unconscious , in so ...
Page 42
... stage of difference to another may , in many cases , be the simple result of the nature of the organism and of the different physical conditions to which it has long been exposed ; but with respect to the more important and adaptive ...
... stage of difference to another may , in many cases , be the simple result of the nature of the organism and of the different physical conditions to which it has long been exposed ; but with respect to the more important and adaptive ...
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Common terms and phrases
adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formations formerly forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellę larvę less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed theory tion variability variations varieties vary whilst whole wings young