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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... successive strata of the earth's crust including extinct remains . We shall , when we come to our chapter on Geology , have to refer again to this subject , and I think we shall then see that the diagram throws light on the affinities ...
... successive strata of the earth's crust including extinct remains . We shall , when we come to our chapter on Geology , have to refer again to this subject , and I think we shall then see that the diagram throws light on the affinities ...
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... successive generations of the more fertile hybrid animals , I hardly know of an in- stance in which two families of the same hybrid have been raised at the same time from different parents , so as to avoid the ill effects of close ...
... successive generations of the more fertile hybrid animals , I hardly know of an in- stance in which two families of the same hybrid have been raised at the same time from different parents , so as to avoid the ill effects of close ...
106 페이지
... successive Silurian deposits of Bohemia and Scandinavia ; never- theless he finds a surprising amount of difference in the species . If the several formations in these regions have not been deposited during the same exact periods , -a ...
... successive Silurian deposits of Bohemia and Scandinavia ; never- theless he finds a surprising amount of difference in the species . If the several formations in these regions have not been deposited during the same exact periods , -a ...
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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