On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430페이지 |
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20 페이지
... breed freely under confinement , even in the many cases when the male and female unite . How many animals there are which will not breed , though living long under not very close con- finement in their native country ! This is generally ...
... breed freely under confinement , even in the many cases when the male and female unite . How many animals there are which will not breed , though living long under not very close con- finement in their native country ! This is generally ...
21 페이지
... breed freely under the most unnatural conditions ( for instance , the rabbit and ferret kept in hutches ) , showing that their reproductive system has not been thus affected ; so will some animals and plants withstand domestication or ...
... breed freely under the most unnatural conditions ( for instance , the rabbit and ferret kept in hutches ) , showing that their reproductive system has not been thus affected ; so will some animals and plants withstand domestication or ...
22 페이지
... Breeders believe that long limbs are almost always accompanied by an elongated head . Some instances of correlation are quite whimsical : thus cats with blue eyes are generally deaf . Colour and constitutional peculiarities go together ...
... Breeders believe that long limbs are almost always accompanied by an elongated head . Some instances of correlation are quite whimsical : thus cats with blue eyes are generally deaf . Colour and constitutional peculiarities go together ...
24 페이지
... breeds are often transmitted either exclusively , or in a much greater degree , to 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 to ...
... breeds are often transmitted either exclusively , or in a much greater degree , to 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 to ...
25 페이지
... breed our cart and race - horses , long and short - horned cattle , and poultry of various breeds , and esculent vegetables , for an almost infinite number of generations , would be opposed to all experience . I may add , that when ...
... breed our cart and race - horses , long and short - horned cattle , and poultry of various breeds , and esculent vegetables , for an almost infinite number of generations , would be opposed to all experience . I may add , that when ...
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accumulated adapted affinities allied species America analogous ancient animals appear archipelago 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 existing exterminated extinct extremely facts favourable fertilised 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 increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely