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 231
... separated sexes , and he asserts that their mutual fertilization is by so much the less easy as their differences are greater . How far these experiments may be trusted , I know not ; but the forms experimentized on are ranked by ...
... separated sexes , and he asserts that their mutual fertilization is by so much the less easy as their differences are greater . How far these experiments may be trusted , I know not ; but the forms experimentized on are ranked by ...
Page 335
... separated by shallow channels are more likely to have been continuously united within a recent périod 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 périod to the mainland than islands separated by deeper channels , we can understand the frequent relation between the depth of the sea and ...
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Common terms and phrases
accumulated adapted affinities allied species amount analogous ancient animals 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 domestic doubt eggs embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flower formations 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 occasionally oceanic islands offspring perfect pigeons pistil plants pollen present probably produced progenitor ranked reciprocal crosses remarked resemblance seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder theory tion trees variability variations vary whole widely