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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322 페이지
... find in nature , not the actual transitional gra- dations by which each complex instinct has been ac- quired for these could be found only in the lineal an- cestors of each species - but we ought to find in the col- lateral lines of ...
... find in nature , not the actual transitional gra- dations by which each complex instinct has been ac- quired for these could be found only in the lineal an- cestors of each species - but we ought to find in the col- lateral lines of ...
115 페이지
... find , as I attempted to show in the last chapter , in any one or in any two formations , all the in- termediate varieties between the species which appeared at the commencement and close of these periods : but we ought to find after ...
... find , as I attempted to show in the last chapter , in any one or in any two formations , all the in- termediate varieties between the species which appeared at the commencement and close of these periods : but we ought to find after ...
133 페이지
... find an alpine species of bizca- cha ; we look to the waters , and we do not find the beaver or musk - rat , but the coypu and capybara , ro- dents of the S. American type . Innumerable other instances could be given . If we look to the ...
... find an alpine species of bizca- cha ; we look to the waters , and we do not find the beaver or musk - rat , but the coypu and capybara , ro- dents of the S. American type . Innumerable other instances could be given . If we look to the ...
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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