The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for LifeP.F. Collier & son, 1902 - 356ÆäÀÌÁö |
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27 ÆäÀÌÁö
... flowers with separate sexes absolutely requiring the agency of certain insects to bring pollen from one flower to the other , it is equally prepos terous to account for the structure of this parasite , INTRODUCTION 27.
... flowers with separate sexes absolutely requiring the agency of certain insects to bring pollen from one flower to the other , it is equally prepos terous to account for the structure of this parasite , INTRODUCTION 27.
60 ÆäÀÌÁö
... flowers , when the flowers of the present day are compared with draw- ings made only twenty or thirty years ago . When a race of plants is once pretty well established , the seed- raisers do not pick out the best plants , but merely go ...
... flowers , when the flowers of the present day are compared with draw- ings made only twenty or thirty years ago . When a race of plants is once pretty well established , the seed- raisers do not pick out the best plants , but merely go ...
61 ÆäÀÌÁö
... flowers of the same varieties ; and the diversity of fruit of the same . species in the orchard , in comparison with the leaves and flowers of the same set of varieties . See how different the leaves of the cabbage are , and how ...
... flowers of the same varieties ; and the diversity of fruit of the same . species in the orchard , in comparison with the leaves and flowers of the same set of varieties . See how different the leaves of the cabbage are , and how ...
66 ÆäÀÌÁö
... flower and kitchen gardens . If it has taken centuries or thousands of years to improve or modify most of our plants up to their present standard of usefulness to man , we can understand how it is that neither Australia , the Cape of ...
... flower and kitchen gardens . If it has taken centuries or thousands of years to improve or modify most of our plants up to their present standard of usefulness to man , we can understand how it is that neither Australia , the Cape of ...
113 ÆäÀÌÁö
... flower . I have also found that the visits of bees are necessary for the fertilization of some kinds of clover ; for instance , 20 heads of Dutch clover ( Trifolium repens ) yielded 2,290 seeds , but 20 other heads protected from bees ...
... flower . I have also found that the visits of bees are necessary for the fertilization of some kinds of clover ; for instance , 20 heads of Dutch clover ( Trifolium repens ) yielded 2,290 seeds , but 20 other heads protected from bees ...
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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 lamell©¡ larv©¡ 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