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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66 페이지
... vary most . Guided by theoretical considerations , I thought that some interesting results might be obtained in regard to the nature and relations of the species which vary most , by tabulating all the varieties in several well- worked ...
... vary most . Guided by theoretical considerations , I thought that some interesting results might be obtained in regard to the nature and relations of the species which vary most , by tabulating all the varieties in several well- worked ...
113 페이지
... varying individual did not actually transmit to its offspring its newly - acquired character , it would undoubtedly ... vary in the same manner has often been so strong that all the individuals of the same species have been similarly ...
... varying individual did not actually transmit to its offspring its newly - acquired character , it would undoubtedly ... vary in the same manner has often been so strong that all the individuals of the same species have been similarly ...
141 페이지
... vary in large genera than in small genera ; and the varying species of the large genera present a greater number of varieties . We have , also , seen that the species , which are the commonest and the most widely diffused , vary more ...
... vary in large genera than in small genera ; and the varying species of the large genera present a greater number of varieties . We have , also , seen that the species , which are the commonest and the most widely diffused , vary more ...
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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