The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432페이지 |
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83개의 결과 중 6 - 10개
26 페이지
... important part which selection by man has played , it becomes at once obvious , how it is that our domestic races show adaptation in their structure or in their habits to man's wants or fancies . We can , I think , further understand ...
... important part which selection by man has played , it becomes at once obvious , how it is that our domestic races show adaptation in their structure or in their habits to man's wants or fancies . We can , I think , further understand ...
28 페이지
... important element is that the animal or plant should be so highly valued by man , that the closest attention is paid to even the slightest deviations in its qualities or structure . Unless such attention be paid nothing can be effected ...
... important element is that the animal or plant should be so highly valued by man , that the closest attention is paid to even the slightest deviations in its qualities or structure . Unless such attention be paid nothing can be effected ...
30 페이지
... important . Something , but how much we do not know , may be attributed to the definite action of the conditions of life . Some , perhaps a great , effect may be attri- buted to the increased use or disuse of parts . The final result is ...
... important . Something , but how much we do not know , may be attributed to the definite action of the conditions of life . Some , perhaps a great , effect may be attri- buted to the increased use or disuse of parts . The final result is ...
32 페이지
... important parts of structure , which he could collect on good authority , as I have collected , during a course of years . It should be remembered that systematists are far from being pleased at finding variability in important ...
... important parts of structure , which he could collect on good authority , as I have collected , during a course of years . It should be remembered that systematists are far from being pleased at finding variability in important ...
33 페이지
... in several respects the most important for us . We have every reason to believe that many of these doubtful and closely allied D forms have permanently retained their characters for a long time. CHAP . II . ] 33 DOUBTFUL SPECIES .
... in several respects the most important for us . We have every reason to believe that many of these doubtful and closely allied D forms have permanently retained their characters for a long time. CHAP . II . ] 33 DOUBTFUL SPECIES .
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase 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 occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young