The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, Volumes 1-2D. Appleton, 1917 - Evolution |
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Page 166
... action of natural selection , and how much to the definite action of the conditions of life . Thus , it is well known to furriers that animals of the same species have thicker and better fur the further north they live ; but who can ...
... action of natural selection , and how much to the definite action of the conditions of life . Thus , it is well known to furriers that animals of the same species have thicker and better fur the further north they live ; but who can ...
Page 320
... action is performed , but not necessarily of its origin . How un- consciously many habitual actions are performed , in- deed not rarely in direct opposition to our conscious will ! yet they may be modified by the will or reason . Habits ...
... action is performed , but not necessarily of its origin . How un- consciously many habitual actions are performed , in- deed not rarely in direct opposition to our conscious will ! yet they may be modified by the will or reason . Habits ...
Page 323
... action was instinctive , and not the result of experience . It is cer- tain , from the observations of Huber , that the aphides show no dislike to the ants : if the latter be not present they are at last compelled to eject their ...
... action was instinctive , and not the result of experience . It is cer- tain , from the observations of Huber , that the aphides show no dislike to the ants : if the latter be not present they are at last compelled to eject their ...
Contents
VARIATION UNDER DOMESTICATION | 7 |
CHAPTER II | 51 |
STRUGGLE FOR EXISTENCE | 66 |
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Common terms and phrases
adapted affinity allied species ancient animals appear Archipelago beak become believe belonging birds breeds Cambrian cause characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo Europe existing extinct extremely facts favourable fertilised fertility fish flowers formation formerly forms fossil Fritz Müller Gärtner genera genus geological geological period Glacial period gradations groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly occur oceanic islands offspring organisation parent peculiar perfect pigeon pistil plants pollen present probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance seeds Silurian slight South America stage stamens sterility structure successive suppose theory tion variability variations varieties vary whilst whole widely different wings