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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82 페이지
... eggs is of some importance to those species which depend on a fluctuating amount of food , for it allows them rapidly to increase in number . But the real importance of a large number of eggs or seeds is to make up for much destruction ...
... eggs is of some importance to those species which depend on a fluctuating amount of food , for it allows them rapidly to increase in number . But the real importance of a large number of eggs or seeds is to make up for much destruction ...
330 페이지
... eggs , not daily , but at intervals of two or three days ; so that , if she were to make her own nest and sit on her own eggs , those first laid would have to be left for some time unincu- bated , or there would be eggs and young birds ...
... eggs , not daily , but at intervals of two or three days ; so that , if she were to make her own nest and sit on her own eggs , those first laid would have to be left for some time unincu- bated , or there would be eggs and young birds ...
332 페이지
... eggs are remarkably small , not exceeding those of the skylark , a bird about one - fourth as large as the cuckoo . That the small size of the egg is a real case of adapta- tion we may infer from the fact of the non - parasitic American ...
... eggs are remarkably small , not exceeding those of the skylark , a bird about one - fourth as large as the cuckoo . That the small size of the egg is a real case of adapta- tion we may infer from the fact of the non - parasitic American ...
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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