On the Origin of Species by Means of Natural Selection |
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Page 9
... occurred to me , in 1837 , that some- thing might perhaps be made out on this question by patiently accumulating and reflecting on all sorts of facts which could possibly have any bearing on it . After five years ' work I allowed myself ...
... occurred to me , in 1837 , that some- thing might perhaps be made out on this question by patiently accumulating and reflecting on all sorts of facts which could possibly have any bearing on it . After five years ' work I allowed myself ...
Page 21
... occur ; but natural selection , as will hereafter be explained , will determine how far the new characters thus arising shall be preserved . When we look to the hereditary varieties or races of our domestic animals and plants , and ...
... occur ; but natural selection , as will hereafter be explained , will determine how far the new characters thus arising shall be preserved . When we look to the hereditary varieties or races of our domestic animals and plants , and ...
Page 29
... occur together in any other species of the whole family . Now , in every one of the domestic breeds , taking thoroughly well - bred birds , all the above marks , even to the white edging of the outer tail - feathers , sometimes con- cur ...
... occur together in any other species of the whole family . Now , in every one of the domestic breeds , taking thoroughly well - bred birds , all the above marks , even to the white edging of the outer tail - feathers , sometimes con- cur ...
Page 49
... occur in deciding whether or not to rank one form as a variety of another , even when they are closely connected by intermediate links ; nor will the commonly - assumed hybrid nature of the in- termediate links always remove the ...
... occur in deciding whether or not to rank one form as a variety of another , even when they are closely connected by intermediate links ; nor will the commonly - assumed hybrid nature of the in- termediate links always remove the ...
Page 55
... , there is no apparent reason why more varieties should occur in a group having many spe cies , than in one having few . To test the truth of this anticipation I have arranged CHAP IL ] 55 SPECIES OF LARGE GENERA VARIABLE .
... , there is no apparent reason why more varieties should occur in a group having many spe cies , than in one having few . To test the truth of this anticipation I have arranged CHAP IL ] 55 SPECIES OF LARGE GENERA VARIABLE .
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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 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 principle 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