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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... intermediate between well - marked varieties in the genus Balanus . And it would appear from information given me by Mr. Watson , Dr. Asa Gray , and Mr. Wol- laston , that generally , when varieties intermediate be- tween two other ...
... intermediate between well - marked varieties in the genus Balanus . And it would appear from information given me by Mr. Watson , Dr. Asa Gray , and Mr. Wol- laston , that generally , when varieties intermediate be- tween two other ...
49 페이지
... intermediate varieties , which have formerly existed , be truly enormous . Why then is not every geological formation and every stra- tum full of such intermediate links ? Geology assured- ly does not reveal any such finely - graduated ...
... intermediate varieties , which have formerly existed , be truly enormous . Why then is not every geological formation and every stra- tum full of such intermediate links ? Geology assured- ly does not reveal any such finely - graduated ...
113 페이지
... intermediate in character between the form of life above and below . We must , however , allow for the entire extinction of some preceding forms , and in any one region for the immi- gration of new forms from other regions , and for a ...
... intermediate in character between the form of life above and below . We must , however , allow for the entire extinction of some preceding forms , and in any one region for the immi- gration of new forms from other regions , and for 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