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 5
... ranges , 46 CHAPTER III . STRUGGLE FOR EXISTENCE . Bears on natural selection - The term used in a wide sense - Geometrical powers of increase - Rapid increase of naturalised animals and plants - Nature of the checks to increase ...
... ranges , 46 CHAPTER III . STRUGGLE FOR EXISTENCE . Bears on natural selection - The term used in a wide sense - Geometrical powers of increase - Rapid increase of naturalised animals and plants - Nature of the checks to increase ...
Page 13
... ranges widely and is very numerous , and why another allied species has a narrow range and is rare ? Yet these relations are of the highest importance , for they determine the present welfare , and , as I believe , the future success ...
... ranges widely and is very numerous , and why another allied species has a narrow range and is rare ? Yet these relations are of the highest importance , for they determine the present welfare , and , as I believe , the future success ...
Page 46
... ranges BEFORE applying the principles arrived at in the last chapter to organic beings in a state of nature , we must briefly discuss whether these latter are subject to any variation . To treat this subject at all properly , a long ...
... ranges BEFORE applying the principles arrived at in the last chapter to organic beings in a state of nature , we must briefly discuss whether these latter are subject to any variation . To treat this subject at all properly , a long ...
Page 51
... ranges ; and lastly , according to very numerous experiments made during several years by that most careful observer Gärt- ner , they can be crossed only with much difficulty . We could hardly wish for better evidence of the two forms ...
... ranges ; and lastly , according to very numerous experiments made during several years by that most careful observer Gärt- ner , they can be crossed only with much difficulty . We could hardly wish for better evidence of the two forms ...
Page 52
... range of his observations , he will meet with more cases of difficulty ; for he will en- counter a greater number of closely - allied forms . But if his observations be widely extended , he will in the end gen- erally be enabled to make ...
... range of his observations , he will meet with more cases of difficulty ; for he will en- counter a greater number of closely - allied forms . But if his observations be widely extended , he will in the end gen- erally be enabled to make ...
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Common terms and phrases
accumulated adapted affinities allied species America amount ancient animals appear become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species disuse divergence domestic doubt embryo endemic Europe existing exterminated extinct extremely facts favourable 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 laws less living look male mammals manner migration modification modified descendants natural selection naturalists nearly nest offspring organic organisation perfect pigeons pistil plants pollen present probably produced progenitor ranked reciprocal crosses remarked resemble rudimentary seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation varieties vary whole widely