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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... migration , the fact is given as something remarkable and exceptional . The incapacity of migrating across a wide sea is more clear in the case of terrestrial mammals than perhaps with any other organic beings ; and , accordingly , we ...
... migration , the fact is given as something remarkable and exceptional . The incapacity of migrating across a wide sea is more clear in the case of terrestrial mammals than perhaps with any other organic beings ; and , accordingly , we ...
138 페이지
... migrated , undergoing modifica- tion during their migration , from some one area . If , when most of the species inhabiting one region are dif- ferent from those of another region , though closely allied to them , it can be shown that ...
... migrated , undergoing modifica- tion during their migration , from some one area . If , when most of the species inhabiting one region are dif- ferent from those of another region , though closely allied to them , it can be shown that ...
271 페이지
... migration by many means . A broken or interrupted range may often be accounted for by the extinction of the species in the intermediate regions . It cannot be denied that we are as yet very ignorant as to the full extent of the various ...
... migration by many means . A broken or interrupted range may often be accounted for by the extinction of the species in the intermediate regions . It cannot be denied that we are as yet very ignorant as to the full extent of the various ...
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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