The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for LifeWerner Company, Book Manufacturers, 1900 - 538페이지 |
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162 페이지
... living species in groups subordinate to groups . Of the many twigs which flour- ished when the tree was a mere bush , only two or three , now grown into great branches , yet survive and bear the other branches ; so with the species ...
... living species in groups subordinate to groups . Of the many twigs which flour- ished when the tree was a mere bush , only two or three , now grown into great branches , yet survive and bear the other branches ; so with the species ...
228 페이지
... living bodies , variation will cause the slight alterations , generation will multiply them almost infinitely , and natural selection will pick out with un- erring skill each improvement . Let this process go on for millions of years ...
... living bodies , variation will cause the slight alterations , generation will multiply them almost infinitely , and natural selection will pick out with un- erring skill each improvement . Let this process go on for millions of years ...
250 페이지
... living creature is due to inheritance ; and consequently , though each being as- suredly is well fitted for its place in nature , many struc- tures have now no very close and direct relation to present habits of life . Thus , we can ...
... living creature is due to inheritance ; and consequently , though each being as- suredly is well fitted for its place in nature , many struc- tures have now no very close and direct relation to present habits of life . Thus , we can ...
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adapted advantage allied 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 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 individuals 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 Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual sexual selection slight stamens structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young