The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life: Reprinted from the Sixth London Edition, with All Additions and CorrectionsA. L. Burt Company, 1890 - 538페이지 |
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68 페이지
... bees do not visit this flower . I have also found that the visits of bees are necessary for the fertilization of some kinds of clover ; for instance twenty heads of Dutch clover ( Trifolium repens ) yielded 2,290 seeds , but twenty ...
... bees do not visit this flower . I have also found that the visits of bees are necessary for the fertilization of some kinds of clover ; for instance twenty heads of Dutch clover ( Trifolium repens ) yielded 2,290 seeds , but twenty ...
88 페이지
... bee can easily suck the nectar out of the incarnate clover , but not out of the common red clover , which is visited by humble - bees alone , so that whole fields of the red clover offer in vain an abun- dant supply of precious nectar ...
... bee can easily suck the nectar out of the incarnate clover , but not out of the common red clover , which is visited by humble - bees alone , so that whole fields of the red clover offer in vain an abun- dant supply of precious nectar ...
267 페이지
... bees in a hive for the secretion of the wax necessary for the construction of their combs . Moreover , many bees have to remain idle for many days during the process of secretion . A large store of honey is indispensable to support a ...
... bees in a hive for the secretion of the wax necessary for the construction of their combs . Moreover , many bees have to remain idle for many days during the process of secretion . A large store of honey is indispensable to support a ...
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자주 나오는 단어 및 구문
adapted admit affinities ALEXANDRE DUMAS allied species America ancient appear 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 Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest oceanic islands offspring organs paleozoic parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds Silurian SIR WALTER SCOTT slight South America stamens sterility structure successive suppose tend theory tion trees variability variations varieties vary whole widely different wings young