On the Origin of Species by Means of Natural Selection: Or the Preservation of Favoured Races in the Struggle for Life |
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Page 85
... separated sexes , and must habitually be crossed . How strange are these facts ! How strange that the pollen and ... separated sexes . When the sexes are separated , although the male and female flowers may be produced on the same tree ...
... separated sexes , and must habitually be crossed . How strange are these facts ! How strange that the pollen and ... separated sexes . When the sexes are separated , although the male and female flowers may be produced on the same tree ...
Page 314
... separated from each other by the Atlantic Ocean and by the extreme northern part of the Pacific . During the Glacial period , when the inhabitants of the Old and New Worlds lived further southwards than at present , they must have been ...
... separated from each other by the Atlantic Ocean and by the extreme northern part of the Pacific . During the Glacial period , when the inhabitants of the Old and New Worlds lived further southwards than at present , they must have been ...
Page 335
... separated by shallow channels are more likely to have been continuously united within a recent period to the mainland than islands separated by deeper channels , we can understand the frequent relation between the depth of the sea and ...
... separated by shallow channels are more likely to have been continuously united within a recent period to the mainland than islands separated by deeper channels , we can understand the frequent relation between the depth of the sea and ...
Contents
INTRODUCTION | 1 |
STRUGGLE FOR EXISTENCE | 52 |
NATURAL SELECTION | 69 |
Copyright | |
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Common terms and phrases
accumulated adapted affinities allied species amount analogous ancient appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distant distinct species divergence doubt embryo Europe existing exterminated extinct extremely facts favourable fertility flowers formation forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important increase in number individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner migration modification modified descendants natural selection naturalists nearly nest occasional oceanic islands offspring Origin of Species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemblance seeds sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory tion trees variability variation vary whole widely