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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... inhabitants will have been numerous in individuals and kinds , and will have been subjected to severe competition . When con- verted by subsidence into large separate islands , there will still have existed many individuals of the same ...
... inhabitants will have been numerous in individuals and kinds , and will have been subjected to severe competition . When con- verted by subsidence into large separate islands , there will still have existed many individuals of the same ...
172 페이지
... inhabitants of that continent , and in those of Europe to the inhabitants of the European continent . And this is the case with some of the American cave - animals , as I hear from Professor Dana ; and some of the Eu- ropean cave ...
... inhabitants of that continent , and in those of Europe to the inhabitants of the European continent . And this is the case with some of the American cave - animals , as I hear from Professor Dana ; and some of the Eu- ropean cave ...
260 페이지
... inhabitants , and consequently leads to success in the battle for life , only in accordance with the standard of that particular country . Hence the inhabitants of one country , generally the smaller one , often yield to the inhabitants ...
... inhabitants , and consequently leads to success in the battle for life , only in accordance with the standard of that particular country . Hence the inhabitants of one country , generally the smaller one , often yield to the inhabitants ...
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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