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 viii
... and of the level of the land , and by occasional means - Dispersal during the Glacial period co - extensive with the world 376-413 .. .. CHAPTER XII . GEOGRAPHICAL DISTRIBUTION - continued . Distribution of viii CONTENTS .
... and of the level of the land , and by occasional means - Dispersal during the Glacial period co - extensive with the world 376-413 .. .. CHAPTER XII . GEOGRAPHICAL DISTRIBUTION - continued . Distribution of viii CONTENTS .
Page 15
... occasionally revert in some of their characters to ancestral forms , it seems to me not improbable , that if we could succeed in naturalising , or were to cultivate , during many genera- tions , the several races , for instance , of the ...
... occasionally revert in some of their characters to ancestral forms , it seems to me not improbable , that if we could succeed in naturalising , or were to cultivate , during many genera- tions , the several races , for instance , of the ...
Page 20
... occasional crosses , if aided by the careful selection of those individual mongrels which present any desired character ; but that a race could be obtained nearly intermediate between two extremely different races or species , I can ...
... occasional crosses , if aided by the careful selection of those individual mongrels which present any desired character ; but that a race could be obtained nearly intermediate between two extremely different races or species , I can ...
Page 27
... occasionally appearing in all the breeds , both when kept pure and when crossed ; the mongrel offspring being perfectly fertile ; -from these several reasons , taken together , we may safely C 2 CHAP . I. 27 DOMESTIC PIGEONS .
... occasionally appearing in all the breeds , both when kept pure and when crossed ; the mongrel offspring being perfectly fertile ; -from these several reasons , taken together , we may safely C 2 CHAP . I. 27 DOMESTIC PIGEONS .
Page 37
... occasional preservation of the best indi- viduals , whether or not sufficiently distinct to be ranked at their first appearance as distinct varieties , and whether or not two or more species or races have become blended together by ...
... occasional preservation of the best indi- viduals , whether or not sufficiently distinct to be ranked at their first appearance as distinct varieties , and whether or not two or more species or races have become blended together by ...
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Common terms and phrases
accumulated adapted affinities allied species America amount analogous ancient animals appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo 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 hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ laws less living male mammals manner Marsupials migration modification modified descendants mongrels natural selection naturalists nearly nest occasionally offspring organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor racter ranked reciprocal crosses remarked resemble rudimentary organs seeds Silurian slight South America sterility structure struggle successive supposed tend theory tion variability variations varieties vary whole widely