On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeMurray, 1860 - 502페이지 |
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3 페이지
... flowers with separate sexes absolutely requiring the agency of certain insects to bring pollen from one flower to the other , it is equally preposterous to account for the structure of this parasite , with its relations to several ...
... flowers with separate sexes absolutely requiring the agency of certain insects to bring pollen from one flower to the other , it is equally preposterous to account for the structure of this parasite , with its relations to several ...
11 페이지
... flowering with plants when transported from one climate to another . In animals it has a more marked effect ; for instance , I find in the domestic duck that the bones of the wing weigh less and the bones of the leg more , in proportion ...
... flowering with plants when transported from one climate to another . In animals it has a more marked effect ; for instance , I find in the domestic duck that the bones of the wing weigh less and the bones of the leg more , in proportion ...
30 페이지
... flower - garden races of plants , most useful to man at different seasons and for different purposes , or so beau- tiful in his eyes , we must , I think , look further than to mere variability . We cannot suppose that all the breeds ...
... flower - garden races of plants , most useful to man at different seasons and for different purposes , or so beau- tiful in his eyes , we must , I think , look further than to mere variability . We cannot suppose that all the breeds ...
32 페이지
... flowers , when the flowers of the present day are compared with drawings 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 drawings 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 ...
33 페이지
... 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 extremely ...
... 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 extremely ...
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accumulated adapted affinities allied species America amount analogous ancient animals appear become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo Europe existing exterminated extinct extremely facts favourable Fcap fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons plants pollen present probably produced progenitor racters ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive supposed tend theory tion variability variations varieties vary whole widely