The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for LifeP.F. Collier & son, 1902 - 356페이지 |
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18 페이지
... living things . ' Further on ( page xc . ) , after referring to geographical distribution , he adds , " These phenomena shake our confidence in the conclusion that the Apteryx of New Zealand and the Red Grouse of England were distinct ...
... living things . ' Further on ( page xc . ) , after referring to geographical distribution , he adds , " These phenomena shake our confidence in the conclusion that the Apteryx of New Zealand and the Red Grouse of England were distinct ...
22 페이지
... living plants and animals are not separated from the 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 ...
... living plants and animals are not separated from the 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 ...
24 페이지
... living at any time to be the result of the gradual modification of pre - existing species - a hypothesis which , though unproven , and sadly damaged by some of its supporters , is yet the only one to which physiology lends any ...
... living at any time to be the result of the gradual modification of pre - existing species - a hypothesis which , though unproven , and sadly damaged by some of its supporters , is yet the only one to which physiology lends any ...
33 페이지
... living together , may be considered as the indefinite effects of the conditions of life on each individual organism , in nearly the same manner as the chill affects different men in an indefinite manner , ac- cording to their state of ...
... living together , may be considered as the indefinite effects of the conditions of life on each individual organism , in nearly the same manner as the chill affects different men in an indefinite manner , ac- cording to their state of ...
37 페이지
... living . " Hairless dogs have imperfect teeth ; long - haired and coarse - haired ani- mals are apt to have , as is asserted , long or many horns ; pigeons with feathered feet have skin between their outer action toes ; pigeons with ...
... living . " Hairless dogs have imperfect teeth ; long - haired and coarse - haired ani- mals are apt to have , as is asserted , long or many horns ; pigeons with feathered feet have skin between their outer action toes ; pigeons with ...
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adapted admit affinities allied species America analogous ancient animals appear beak become bees believe belonging birds breeds cause cells characters climate closely allied color common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological 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 male mammals manner marsupial migration modification modified descendants natural selection naturalists nearly nest offspring organs ORIGIN OF SPECIES paleozoic parent peculiar perfect pigeon pistil plants pollen present principle probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder theory tion trees variability variations varieties vary whole wings young