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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... believe that barbarian man existed at an enormously remote period ; and we know that at the pres- ent day there is hardly a tribe so barbarous , as not to have domesticated at least the dog . The origin of most of our domestic animals ...
... believe that barbarian man existed at an enormously remote period ; and we know that at the pres- ent day there is hardly a tribe so barbarous , as not to have domesticated at least the dog . The origin of most of our domestic animals ...
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Charles Darwin. believe that natural selection could produce , on the one hand , an organ of trifling importance , such as the tail of a giraffe , which serves as a fly - flapper , and , on ... believe the 308 [ CHAP . VL ABSENCE OR RARITY.
Charles Darwin. believe that natural selection could produce , on the one hand , an organ of trifling importance , such as the tail of a giraffe , which serves as a fly - flapper , and , on ... believe the 308 [ CHAP . VL ABSENCE OR RARITY.
250 페이지
... believe that the webbed feet of the upland goose or of the frigate- bird are of special use to these birds ; we ... believe that the progenitor of the seal did not possess a flipper , but a foot with five toes fitted for walking or ...
... believe that the webbed feet of the upland goose or of the frigate- bird are of special use to these birds ; we ... believe that the progenitor of the seal did not possess a flipper , but a foot with five toes fitted for walking or ...
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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