On the Origin of Species by Means of Natural Selection |
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Page 7
... occasional means - Dispersal during the Glacial period co - extensive with the world , • 302 CHAPTER XII . GEOGRAPHICAL DISTRIBUTION - Continued . Distribution of fresh - water productions - On the inhabitants of oceanic islands - Ab ...
... occasional means - Dispersal during the Glacial period co - extensive with the world , • 302 CHAPTER XII . GEOGRAPHICAL DISTRIBUTION - Continued . Distribution of fresh - water productions - On the inhabitants of oceanic islands - Ab ...
Page 20
... 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 generations , 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 generations , the several races , for instance , of the ...
Page 25
... 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 31
... occasionally appearing in all the breeds , both when kept pure and when crossed ; the mongrel offspring being perfectly fertile ; -from these several reasons , taken to- gether , I can feel no doubt that all our domestic breeds have ...
... occasionally appearing in all the breeds , both when kept pure and when crossed ; the mongrel offspring being perfectly fertile ; -from these several reasons , taken to- gether , I can feel no doubt that all our domestic breeds have ...
Page 39
... occasional preservation of the best individuals , 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 individuals , 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 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