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 311
... follows . But we shall follow the changes more readily by supposing a new glacial period to come slowly on , and then pass away , as formerly occurred . As the cold came on , and as each more southern zone became fitted for arctic ...
... follows . But we shall follow the changes more readily by supposing a new glacial period to come slowly on , and then pass away , as formerly occurred . As the cold came on , and as each more southern zone became fitted for arctic ...
Page 402
... follow nearly the same instincts ; why the thrush of South America , for instance , lines her nest with mud like our British species . On the view of instincts having been slowly acquired through natural selection we need not marvel at ...
... follow nearly the same instincts ; why the thrush of South America , for instance , lines her nest with mud like our British species . On the view of instincts having been slowly acquired through natural selection we need not marvel at ...
Page 403
... follows on the principle of natural selection ; for old forms will be supplanted by new and improved forms . Neither single species nor groups of species reappear when the chain of ordinary generation has once been broken . The gradual ...
... follows on the principle of natural selection ; for old forms will be supplanted by new and improved forms . Neither single species nor groups of species reappear when the chain of ordinary generation has once been broken . The gradual ...
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