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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... naturalists , some of them personally unknown to me . I cannot , however , let this opportunity pass without expressing my deep obligations to Dr. Hooker , who , for the last fifteen years , has aided me in every possible way by his ...
... naturalists , some of them personally unknown to me . I cannot , however , let this opportunity pass without expressing my deep obligations to Dr. Hooker , who , for the last fifteen years , has aided me in every possible way by his ...
54 페이지
... naturalists have honestly confessed ) which do not vary ; and , under this point of view , no instance will ever be found of an important part varying ; but under any other point of view many instances assuredly can be given . 66 There ...
... naturalists have honestly confessed ) which do not vary ; and , under this point of view , no instance will ever be found of an important part varying ; but under any other point of view many instances assuredly can be given . 66 There ...
61 페이지
... naturalists maintain that animals never present varieties ; but then these same naturalists rank the slightest difference as of specific value ; and when the same identical form is met with in two distant countries , or in two ...
... naturalists maintain that animals never present varieties ; but then these same naturalists rank the slightest difference as of specific value ; and when the same identical form is met with in two distant countries , or in two ...
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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