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 102
... supposed to be extremely slight , but of the most diversified nature ; they are not supposed all to appear simultaneously , but often after long intervals of time ; nor are they all supposed to endure for equal periods . Only those ...
... supposed to be extremely slight , but of the most diversified nature ; they are not supposed all to appear simultaneously , but often after long intervals of time ; nor are they all supposed to endure for equal periods . Only those ...
Page 105
... supposed to be represented between the horizontal lines . After fourteen thousand generations , six new species , marked by the letters n14 to z14 , are supposed to have been produced . In each genus , the species , which are already ...
... supposed to be represented between the horizontal lines . After fourteen thousand generations , six new species , marked by the letters n14 to z14 , are supposed to have been produced . In each genus , the species , which are already ...
Page 108
... supposed single parent of our several new sub - genera and genera . It is worth while to reflect for a moment on the character of the new species F14 , which is supposed not to have diverged much in character , but to have retained the ...
... supposed single parent of our several new sub - genera and genera . It is worth while to reflect for a moment on the character of the new species F14 , which is supposed not to have diverged much in character , but to have retained the ...
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