The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for Life, Volume 1 |
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Page xiv
... crossing of already existing forms , and much to use and disuse , that is , to the effects of habit . To this latter agency he seems to attribute all the beautiful adaptations in nature ; —such as the long neck of the giraffe for ...
... crossing of already existing forms , and much to use and disuse , that is , to the effects of habit . To this latter agency he seems to attribute all the beautiful adaptations in nature ; —such as the long neck of the giraffe for ...
Page 10
... crossing of distinct . species , and that which may be observed with plants and animals when reared under new or unnatural conditions . Many facts clearly show how eminently susceptible the reproductive system is to very slight changes ...
... crossing of distinct . species , and that which may be observed with plants and animals when reared under new or unnatural conditions . Many facts clearly show how eminently susceptible the reproductive system is to very slight changes ...
Page 17
... crossing , that only a single variety should have been turned loose in its new home . Nevertheless , as our varieties certainly do occasionally revert in some of their characters to ancestral forms , it seems to me not improbable that ...
... crossing , that only a single variety should have been turned loose in its new home . Nevertheless , as our varieties certainly do occasionally revert in some of their characters to ancestral forms , it seems to me not improbable that ...
Page 18
... crossed , a subject hereafter to be discussed ) , domestic races of the same species differ from each other in the same manner as do the closely- allied species of the same genus in a state of nature , but the differences in most cases ...
... crossed , a subject hereafter to be discussed ) , domestic races of the same species differ from each other in the same manner as do the closely- allied species of the same genus in a state of nature , but the differences in most cases ...
Page 21
... , that all the races belong to the same species . Having kept nearly all the English breeds of the fowl alive , having bred and crossed them , and examined their skeletons , CHAP . I. ] CHARACTER OF DOMESTIC VARIETIES . 21.
... , that all the races belong to the same species . Having kept nearly all the English breeds of the fowl alive , having bred and crossed them , and examined their skeletons , CHAP . I. ] CHARACTER OF DOMESTIC VARIETIES . 21.
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Common terms and phrases
adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important improved increase in number individual differences inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less likewise males manner Melipona Mivart natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species perfect period pigeons pollen pollen-grains present preserved principle probably produced progenitor quadrupeds rank Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual sexual selection slight stamens structure struggle supposed swimbladder tend tendency tion transitional tree variability variations varieties vary widely wings young