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 60
... forms , naturalists are com- pelled to come to a determination by the amount of difference between them , judging by analogy whether or not the amount suffices to raise one or both to the rank of species . Hence the amount of difference ...
... forms , naturalists are com- pelled to come to a determination by the amount of difference between them , judging by analogy whether or not the amount suffices to raise one or both to the rank of species . Hence the amount of difference ...
Page 61
... forms linking them together , and the occurrence of such links does not affect the character of the forms which they connect ; and except , secondly , by a certain amount of difference , for two forms , if differing very little , are ...
... forms linking them together , and the occurrence of such links does not affect the character of the forms which they connect ; and except , secondly , by a certain amount of difference , for two forms , if differing very little , are ...
Page 80
... forms would certainly immigrate , and this also would seriously disturb the relations of some of the former inhabitants . Let it be remembered how powerful the influence of a single introduced tree or mammal has been shown to be . But ...
... forms would certainly immigrate , and this also would seriously disturb the relations of some of the former inhabitants . Let it be remembered how powerful the influence of a single introduced tree or mammal has been shown to be . But ...
Page 101
... forms will have been more slowly formed , and old forms more slowly exterminated . And it is in fresh water that we find seven genera of Ganoid fishes , remnants of a once preponderant order : and in fresh water we find some of the most ...
... forms will have been more slowly formed , and old forms more slowly exterminated . And it is in fresh water that we find seven genera of Ganoid fishes , remnants of a once preponderant order : and in fresh water we find some of the most ...
Page 102
... forms having been checked . But the action of natural selection will probably still oftener depend on some few of ... forms , it follows that as each selected and favoured form increases in number , so generally will the less 102 NATURAL ...
... forms having been checked . But the action of natural selection will probably still oftener depend on some few of ... forms , it follows that as each selected and favoured form increases in number , so generally will the less 102 NATURAL ...
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Common terms and phrases
accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely