The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435페이지 |
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vi 페이지
... Extinction caused by Natural Se- lection - Divergence of Character , related to the diversity of inhabitants of any small area , and to naturalisation - Action of Natural Selection , through Divergence of Character and Extinction , on ...
... Extinction caused by Natural Se- lection - Divergence of Character , related to the diversity of inhabitants of any small area , and to naturalisation - Action of Natural Selection , through Divergence of Character and Extinction , on ...
xi 페이지
... Extinct forms serving to connect existing groups . On earth adhering to the feet of migratory birds . On the wide geographical range of a species of Galaxias , a fresh - water fish . Discussion on analogical resemblances , enlarged and ...
... Extinct forms serving to connect existing groups . On earth adhering to the feet of migratory birds . On the wide geographical range of a species of Galaxias , a fresh - water fish . Discussion on analogical resemblances , enlarged and ...
xxiv 페이지
... extinct by new creations , but are to be regarded as their descendants through contin- ued reproduction . " A well - known French botanist , M. Lecoq , writes in 1854 ( Etudes sur Géograph . Bot . , ' tom . i . p . 250 ) , " On voit que ...
... extinct by new creations , but are to be regarded as their descendants through contin- ued reproduction . " A well - known French botanist , M. Lecoq , writes in 1854 ( Etudes sur Géograph . Bot . , ' tom . i . p . 250 ) , " On voit que ...
6 페이지
... extinct species , in the same manner as the acknowledged varieties of any one species are the de- scendants of that species . Furthermore , I am convinced that Natural Selection has been the most important , but not the exclusive ...
... extinct species , in the same manner as the acknowledged varieties of any one species are the de- scendants of that species . Furthermore , I am convinced that Natural Selection has been the most important , but not the exclusive ...
27 페이지
... extinct in the wild state . But birds breeding on precipices , and good fliers , are unlikely to be ex- terminated ; and the commen rock - pigeon , which has the same habits with the domestic breeds , has not been exterminated even on ...
... extinct in the wild state . But birds breeding on precipices , and good fliers , are unlikely to be ex- terminated ; and the commen rock - pigeon , which has the same habits with the domestic breeds , has not been exterminated even on ...
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adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young