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 84
... Climate plays an important part in determining the average number of a species , and periodical seasons of extreme ... climate seems at first sight to be quite indepen- dent of the struggle for existence ; but in so far as climate ...
... Climate plays an important part in determining the average number of a species , and periodical seasons of extreme ... climate seems at first sight to be quite indepen- dent of the struggle for existence ; but in so far as climate ...
Page 85
... climate being conspicuous , we are tempted to at- tribute the whole effect to its direct action . But this is a false view ; we forget that each species , even where it most abounds , is constantly suffering enormous de- struction at ...
... climate being conspicuous , we are tempted to at- tribute the whole effect to its direct action . But this is a false view ; we forget that each species , even where it most abounds , is constantly suffering enormous de- struction at ...
Page 174
... climate , or conversely . So again , many succulent plants cannot endure a damp climate . But the degree of adaptation of species to the climates under which they live is often overrated . We may infer this from our frequent inability ...
... climate , or conversely . So again , many succulent plants cannot endure a damp climate . But the degree of adaptation of species to the climates under which they live is often overrated . We may infer this from our frequent inability ...
Contents
VARIATION UNDER DOMESTICATION | 7 |
CHAPTER II | 51 |
STRUGGLE FOR EXISTENCE | 66 |
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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