The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, 1-2권D. Appleton, 1917 |
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... single one ; but this difference does not determine how many individuals of the two species can be supported in a district . A large number of eggs is of some importance to those species which depend on a fluctuating amount of food ...
... single one ; but this difference does not determine how many individuals of the two species can be supported in a district . A large number of eggs is of some importance to those species which depend on a fluctuating amount of food ...
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... single species or any single genus endures . There is reason to believe that the extinction of a whole group of species is generally a slower process than their pro- duction : if their appearance and disappearance be rep- resented , as ...
... single species or any single genus endures . There is reason to believe that the extinction of a whole group of species is generally a slower process than their pro- duction : if their appearance and disappearance be rep- resented , as ...
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... single parent . To illustrate what I mean : our English race - horses differ from the horses of every other breed ; but they do not owe their difference and superiority to descent from any single pair , but to continued care in the ...
... single parent . To illustrate what I mean : our English race - horses differ from the horses of every other breed ; but they do not owe their difference and superiority to descent from any single pair , but to continued care in the ...
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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