The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권D. Appleton, 1898 |
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4 페이지
... chance of making out this obscure problem . Nor have I been disappointed ; in this and in all other per- plexing cases I have invariably found that our knowl- edge , imperfect though it be , of variation under domes- tication , afforded ...
... chance of making out this obscure problem . Nor have I been disappointed ; in this and in all other per- plexing cases I have invariably found that our knowl- edge , imperfect though it be , of variation under domes- tication , afforded ...
5 페이지
... chance of surviving , and thus be naturally selected . From the strong principle of inheri- tance , any selected variety will tend to propagate its new and modified form . This fundamental subject of Natural Selection will be treated at ...
... chance of surviving , and thus be naturally selected . From the strong principle of inheri- tance , any selected variety will tend to propagate its new and modified form . This fundamental subject of Natural Selection will be treated at ...
14 페이지
... chance of living . " Hairless dogs have imperfect teeth ; long - haired and coarse - haired animals are apt to have , as is asserted , long or many horns ; pigeons with feathered feet have skin between their outer toes ; pigeons with ...
... chance of living . " Hairless dogs have imperfect teeth ; long - haired and coarse - haired animals are apt to have , as is asserted , long or many horns ; pigeons with feathered feet have skin between their outer toes ; pigeons with ...
15 페이지
... chances almost compels us to attribute its reappearance to inheritance . Every one must have heard of cases of albinism , prickly skin , hairy bodies , & c . , appearing in several members of the same family . If strange and rare ...
... chances almost compels us to attribute its reappearance to inheritance . Every one must have heard of cases of albinism , prickly skin , hairy bodies , & c . , appearing in several members of the same family . If strange and rare ...
28 페이지
... chance picked out extraordinarily abnormal species ; and further , that these very species have since all become extinct or unknown . So many strange con- tigencies are improbable in the highest degree . Some facts in regard to the ...
... chance picked out extraordinarily abnormal species ; and further , that these very species have since all become extinct or unknown . So many strange con- tigencies are improbable in the highest degree . Some facts in regard to the ...
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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 descendants 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 increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young