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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72 페이지
... remarked , little groups of species are generally clustered like satellites around other species . And what are varieties but groups of forms , unequally related to each other , and clustered round certain forms — that is , round their ...
... remarked , little groups of species are generally clustered like satellites around other species . And what are varieties but groups of forms , unequally related to each other , and clustered round certain forms — that is , round their ...
184 페이지
... remarked by Is . Geoffry St. Hilaire , both with varieties and species , that when any part or organ is repeated many times in the same in- dividual ( as the vertebræ in snakes , and the stamens in polyandrous flowers ) the number is ...
... remarked by Is . Geoffry St. Hilaire , both with varieties and species , that when any part or organ is repeated many times in the same in- dividual ( as the vertebræ in snakes , and the stamens in polyandrous flowers ) the number is ...
192 페이지
... to very large groups of beetles , but in the Engidæ , as Westwood has remarked , the number varies greatly ; and the number likewise differs in the two sexes of the same species . Again in the fossorial 192 [ CHAP . V. SECONDARY SEXUAL.
... to very large groups of beetles , but in the Engidæ , as Westwood has remarked , the number varies greatly ; and the number likewise differs in the two sexes of the same species . Again in the fossorial 192 [ CHAP . V. SECONDARY SEXUAL.
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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