The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538페이지 |
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37 페이지
... probably with the length of hair . With respect to fleetness , which depends on many bodily characters , Eclipse was far fleeter , and a dray - horse is comparably stronger , than any two natural species belonging to the same genus . So ...
... probably with the length of hair . With respect to fleetness , which depends on many bodily characters , Eclipse was far fleeter , and a dray - horse is comparably stronger , than any two natural species belonging to the same genus . So ...
189 페이지
... probably affect the hind limbs from exercising them more , and possibly even the form of the pelvis ; and then by the law of homologous variation , the front limbs and the head would probably be affected . The shape , also , of the ...
... probably affect the hind limbs from exercising them more , and possibly even the form of the pelvis ; and then by the law of homologous variation , the front limbs and the head would probably be affected . The shape , also , of the ...
338 페이지
... probably differed greatly from any known animal . Some of the most ancient animals , as the Nautilus , Liugula , etc. , do not differ much from living species ; and it cannot on our theory be sup- posed , that these old species were the ...
... probably differed greatly from any known animal . Some of the most ancient animals , as the Nautilus , Liugula , etc. , do not differ much from living species ; and it cannot on our theory be sup- posed , that these old species were the ...
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adapted admit affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gilt top Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest oceanic islands offspring organs parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive suppose tend theory tion variability variations varieties vary whole widely different wings young