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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207 페이지
... habits of life- Diversified habits in the same species - Species with habits widely different from those of their allies - Organs of extreme perfection - Modes of transition - Cases of difficulty - Natura non facit saltum - Organs of ...
... habits of life- Diversified habits in the same species - Species with habits widely different from those of their allies - Organs of extreme perfection - Modes of transition - Cases of difficulty - Natura non facit saltum - Organs of ...
219 페이지
... habits of life will rarely have been developed at an early period in great numbers and under many subordinate forms ... habits in the individuals of the same species . In either case it would be easy for natu- ral selection to adapt the ...
... habits of life will rarely have been developed at an early period in great numbers and under many subordinate forms ... habits in the individuals of the same species . In either case it would be easy for natu- ral selection to adapt the ...
220 페이지
... habits ; both probably often occurring almost simultaneously . Of cases of changed habits it will suffice merely to allude to that of the many British insects which now feed on exotic plants , or exclusively on artificial substances ...
... habits ; both probably often occurring almost simultaneously . Of cases of changed habits it will suffice merely to allude to that of the many British insects which now feed on exotic plants , or exclusively on artificial substances ...
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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