On the Origin of the Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1869 - 596페이지 |
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63개의 결과 중 1 - 5개
vi 페이지
... Climate Protection from the number of individuals - Complex relations of all animals and plants throughout nature - Struggle for life most severe between individuals and varieties of the same species ; often severe be- tween species of ...
... Climate Protection from the number of individuals - Complex relations of all animals and plants throughout nature - Struggle for life most severe between individuals and varieties of the same species ; often severe be- tween species of ...
ix 페이지
... climate and of the level of the land , and by occasional means Dispersal during the Glacial period - Alternate Glacial periods in the north and south l'age 422-461 CHAPTER XII . GEOGRAPHICAL DISTRIBUTION - continued . ---- Distribution ...
... climate and of the level of the land , and by occasional means Dispersal during the Glacial period - Alternate Glacial periods in the north and south l'age 422-461 CHAPTER XII . GEOGRAPHICAL DISTRIBUTION - continued . ---- Distribution ...
xvii 페이지
... climate , this would at length become the most prevalent , if not the only race , in the particular country in which it had originated . " He then extends these same views to the white inhabitants of colder climates . I am indebted to ...
... climate , this would at length become the most prevalent , if not the only race , in the particular country in which it had originated . " He then extends these same views to the white inhabitants of colder climates . I am indebted to ...
3 페이지
... climate , food , & c . , as the only pos- sible cause of variation . In one limited sense , as we shall hereafter see , this may be true ; but it is pre- posterous to attribute to mere external conditions , the structure , for instance ...
... climate , food , & c . , as the only pos- sible cause of variation . In one limited sense , as we shall hereafter see , this may be true ; but it is pre- posterous to attribute to mere external conditions , the structure , for instance ...
7 페이지
... climates and treatment , we are driven to conclude that this great variability is due to our domestic pro- ductions having been raised under conditions of life not so uniform as , and somewhat different from , those to which the parent ...
... climates and treatment , we are driven to conclude that this great variability is due to our domestic pro- ductions having been raised under conditions of life not so uniform as , and somewhat different from , those to which the parent ...
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accumulated adapted affinities allied species America ancient appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt Edition eggs embryo existing exterminated extinct extremely facts favourable females fertilised fertility flowers formation forms fossil Fritz Müller Gärtner genera genus geological Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ less living males mammals manner migration modified descendants natural selection naturalists nearly nest occur oceanic islands offspring organisation parent perfect pigeons pistil pollen Post 8vo present principle probably produced progenitor racters ranked reciprocal crosses remarked resemble seeds sexual sexual selection Silurian slight South America stamens sterility structure struggle successive suppose theory tion variability variations varieties vary vols whole widely