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 211
... considered . The distinction has probably been slurred over , owing to the sterility in both cases being looked on as a special endow- ment , beyond the province of our reasoning powers . The fertility of varieties , that is of forms ...
... considered . The distinction has probably been slurred over , owing to the sterility in both cases being looked on as a special endow- ment , beyond the province of our reasoning powers . The fertility of varieties , that is of forms ...
Page 217
... European and the humped Indian cattle are quite fertile together ; but from facts communicated to me by Mr. Blyth , I think they must be considered as distinct species . On this view of the origin of many of our HYBRIDISM 217.
... European and the humped Indian cattle are quite fertile together ; but from facts communicated to me by Mr. Blyth , I think they must be considered as distinct species . On this view of the origin of many of our HYBRIDISM 217.
Page 353
... considered of very trifling physio- logical importance , but which are universally admitted as highly serviceable in the definition of whole groups . For instance , whether or not there is an open passage from the nostrils to the mouth ...
... considered of very trifling physio- logical importance , but which are universally admitted as highly serviceable in the definition of whole groups . For instance , whether or not there is an open passage from the nostrils to the mouth ...
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