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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130 페이지
... less severe , and there will have been less modifica- tion and less extermination . Hence , we can understand how it is that the flora of Madeira , according to Oswald Heer , resembles to a certain extent the extinct tertiary flora of ...
... less severe , and there will have been less modifica- tion and less extermination . Hence , we can understand how it is that the flora of Madeira , according to Oswald Heer , resembles to a certain extent the extinct tertiary flora of ...
199 페이지
... less direct competition with each other and with the aborigines ; and according as the immigrants were capable of varying more or less rapidly , there would ensue in the two or more regions , independently of their physical conditions ...
... less direct competition with each other and with the aborigines ; and according as the immigrants were capable of varying more or less rapidly , there would ensue in the two or more regions , independently of their physical conditions ...
262 페이지
... less and less during many generations , owing to some change of habits , or if an organ or gland was less and less functionally exercised , we may infer that it would become reduced in size in the adult descendants of this animal , but ...
... less and less during many generations , owing to some change of habits , or if an organ or gland was less and less functionally exercised , we may infer that it would become reduced in size in the adult descendants of this animal , but ...
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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