On the Origin of the Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1869 - 596페이지 |
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10 페이지
... breed freely under confinement , even when the male and female unite . How many animals there are which will not breed , though kept in an almost free state in their native country ! This is generally , but erroneously , attri- buted to ...
... breed freely under confinement , even when the male and female unite . How many animals there are which will not breed , though kept in an almost free state in their native country ! This is generally , but erroneously , attri- buted to ...
11 페이지
... breed freely under the most unnatural conditions ( for instance , rabbits and ferrets kept in hutches ) , showing that their reproductive organs are not affected ; so will some animals and plants withstand domestication or cultivation ...
... breed freely under the most unnatural conditions ( for instance , rabbits and ferrets kept in hutches ) , showing that their reproductive organs are not affected ; so will some animals and plants withstand domestication or cultivation ...
12 페이지
... Breeders believe that long limbs are almost always accompanied by an elongated head . Some instances of correlation are quite whimsical : thus cats which are entirely white and have blue eyes are generally deaf . Colour and 12 CHAP . I ...
... Breeders believe that long limbs are almost always accompanied by an elongated head . Some instances of correlation are quite whimsical : thus cats which are entirely white and have blue eyes are generally deaf . Colour and 12 CHAP . I ...
15 페이지
... breeds are often transmitted , either exclusively or in a much greater degree , to the males alone . A much more important rule , which I think may be trusted , is that , at whatever period of life a peculiarity first appears , it tends ...
... breeds are often transmitted , either exclusively or in a much greater degree , to the males alone . A much more important rule , which I think may be trusted , is that , at whatever period of life a peculiarity first appears , it tends ...
16 페이지
... breed our cart and race - horses , long and short - horned cattle , and poultry of various breeds , and esculent vegetables , for an unlimited number of generations , would be opposed 16 CHAP . I. VARIATION.
... breed our cart and race - horses , long and short - horned cattle , and poultry of various breeds , and esculent vegetables , for an unlimited number of generations , would be opposed 16 CHAP . I. VARIATION.
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accumulated adapted affinities allied species America ancient appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt Edition eggs embryo existing exterminated extinct extremely facts favourable females fertilised fertility flowers formation forms fossil Fritz Müller Gärtner genera genus geological Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ less living males mammals manner migration modified descendants natural selection naturalists nearly nest occur oceanic islands offspring organisation parent perfect pigeons pistil pollen Post 8vo present principle probably produced progenitor racters ranked reciprocal crosses remarked resemble seeds sexual sexual selection Silurian slight South America stamens sterility structure struggle successive suppose theory tion variability variations varieties vary vols whole widely