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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283 페이지
... resemble for the sake of protection various objects , such as green or decayed leaves , dead twigs , bits of lichen ... resemblance is often wonderfully close , and is not confined to colour , but extends to form , and even to the manner ...
... resemble for the sake of protection various objects , such as green or decayed leaves , dead twigs , bits of lichen ... resemblance is often wonderfully close , and is not confined to colour , but extends to form , and even to the manner ...
284 페이지
... resemble in some degree a dead twig or a decayed leaf , and that it varied slightly in many ways , then all the ... resemblance , that a na- tive Dyak maintained that the foliaceous excrescences were really moss . Insects are preyed on ...
... resemble in some degree a dead twig or a decayed leaf , and that it varied slightly in many ways , then all the ... resemblance , that a na- tive Dyak maintained that the foliaceous excrescences were really moss . Insects are preyed on ...
16 페이지
... resemble in external appearance either parent ; and lastly , that the facility of making a first cross between any two species is not always governed by their syste- matic affinity or degree of resemblance to each other . This latter ...
... resemble in external appearance either parent ; and lastly , that the facility of making a first cross between any two species is not always governed by their syste- matic affinity or degree of resemblance to each other . This latter ...
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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