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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14 페이지
... descended , like varieties , from other species . Nevertheless , such a conclusion , even if well founded , would be unsatisfactory , until it could be shown how the innumerable species inhabiting this world have been modified , so as ...
... descended , like varieties , from other species . Nevertheless , such a conclusion , even if well founded , would be unsatisfactory , until it could be shown how the innumerable species inhabiting this world have been modified , so as ...
26 페이지
... descended from one or several parent - species .. This point , if it could be cleared up , would be interesting ; if , for instance , it could be shown that the greyhound , bloodhound , terrier , spaniel , and bull - dog , which we al ...
... descended from one or several parent - species .. This point , if it could be cleared up , would be interesting ; if , for instance , it could be shown that the greyhound , bloodhound , terrier , spaniel , and bull - dog , which we al ...
27 페이지
... descended from distinct species . ] In the case of some other domesticated species , there is presumptive , or even strong evidence , that all the breeds have descended from a single wild stock . It has often been assumed that man has ...
... descended from distinct species . ] In the case of some other domesticated species , there is presumptive , or even strong evidence , that all the breeds have descended from a single wild stock . It has often been assumed that man has ...
28 페이지
... descended from a different aboriginal stock from our European cattle ; and several competent judges believe that these latter have had more than one wild parent . With respect to horses , from reasons which I cannot here give , I am ...
... descended from a different aboriginal stock from our European cattle ; and several competent judges believe that these latter have had more than one wild parent . With respect to horses , from reasons which I cannot here give , I am ...
29 페이지
... descended from several wild species , it cannot be doubted that there has been an immense amount of inherited variation ; for who will believe that animals closely resembling the Italian greyhound , the bloodhound , the bull - dog , pug ...
... descended from several wild species , it cannot be doubted that there has been an immense amount of inherited variation ; for who will believe that animals closely resembling the Italian greyhound , the bloodhound , the bull - dog , pug ...
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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