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 15
... greater degree , to the males alone . A much more important rule , which I think may be trusted , is that , at whatever period of life a peculiarity first appears , it tends to reappear in the offspring at a corresponding age , though ...
... greater degree , to the males alone . A much more important rule , which I think may be trusted , is that , at whatever period of life a peculiarity first appears , it tends to reappear in the offspring at a corresponding age , though ...
Page 29
... greater number of generations . In a breed which has been crossed only once , the tendency to revert to any character derived from such a cross will naturally become less and less , as in each suc ceeding generation there will be less ...
... greater number of generations . In a breed which has been crossed only once , the tendency to revert to any character derived from such a cross will naturally become less and less , as in each suc ceeding generation there will be less ...
Page 49
... greater or less force of inheritance and reversion determine whether variations shall endure . Variability is governed by many unknown . laws , of which correlated growth is probably the most important . Something , but how much we do ...
... greater or less force of inheritance and reversion determine whether variations shall endure . Variability is governed by many unknown . laws , of which correlated growth is probably the most important . Something , but how much we do ...
Page 59
... greater amount of differ- ence than that between the local forms and sub - species , they are almost universally ranked by naturalists as true species . Nevertheless , no certain criterion can possibly be given by which variable forms ...
... greater amount of differ- ence than that between the local forms and sub - species , they are almost universally ranked by naturalists as true species . Nevertheless , no certain criterion can possibly be given by which variable forms ...
Page 62
... result of so much labour , he emphatically remarks : " They are are mistaken , who repeat that the greater part of our species are clearly limited , and that the doubtful species are in a 62 [ CHAP . II . DOUBTFUL SPECIES .
... result of so much labour , he emphatically remarks : " They are are mistaken , who repeat that the greater part of our species are clearly limited , and that the doubtful species are in a 62 [ CHAP . II . DOUBTFUL SPECIES .
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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 lamellę larvę 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