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 xix
... marked by intervals of organic character , which we find to be a practical difficulty in ascertaining affinities ; second , of another impulse connected with the vital forces , tending , in the course of generations , to modify organic ...
... marked by intervals of organic character , which we find to be a practical difficulty in ascertaining affinities ; second , of another impulse connected with the vital forces , tending , in the course of generations , to modify organic ...
Page 9
... marked differences occasionally appear in the young of the same litter , and in seedlings from the same seed - capsule . At long intervals of time , out of millions of individuals reared in the same country and fed on nearly the same ...
... marked differences occasionally appear in the young of the same litter , and in seedlings from the same seed - capsule . At long intervals of time , out of millions of individuals reared in the same country and fed on nearly the same ...
Page 12
... marked influence ; thus I find in the domestic duck that the bones of the wing weigh less and the bones of the leg more , in proportion to the whole skeleton , than do the same bones in the wild - duck ; and this change may be safely ...
... marked influence ; thus I find in the domestic duck that the bones of the wing weigh less and the bones of the leg more , in proportion to the whole skeleton , than do the same bones in the wild - duck ; and this change may be safely ...
Page 16
... proving its truth : we may safely conclude that very many of the most strongly marked domestic varieties could not possibly live in a wild state . In many cases we do no know what 16 [ CHAP . I. VARIATION UNDER DOMESTICATION .
... proving its truth : we may safely conclude that very many of the most strongly marked domestic varieties could not possibly live in a wild state . In many cases we do no know what 16 [ CHAP . I. VARIATION UNDER DOMESTICATION .
Page 18
... marked distinction existed between a domestic race and a species , this source of doubt would not so perpetually recur . It has often been stated that domestic races do not differ from each other in characters of generic value . It can ...
... marked distinction existed between a domestic race and a species , this source of doubt would not so perpetually recur . It has often been stated that domestic races do not differ from each other in characters of generic value . It can ...
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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