The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for Life, Том 1Humboldt Publishing Company, 1884 - Всего страниц: 253 |
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Стр. 500
... quadrupeds . 196. Instances could be given of sim- ilar varieties being produced from the same species under external conditions of life as different as can well be conceived ; and , on the other hand , of dissimilar va- rieties being ...
... quadrupeds . 196. Instances could be given of sim- ilar varieties being produced from the same species under external conditions of life as different as can well be conceived ; and , on the other hand , of dissimilar va- rieties being ...
Стр. 540
... quadrupeds the history of mankind did not occur in have not acquired much elongated necks one country , while it did in another . We or other means for browsing on the high- are ignorant with respect to the condi- er branches of trees ...
... quadrupeds the history of mankind did not occur in have not acquired much elongated necks one country , while it did in another . We or other means for browsing on the high- are ignorant with respect to the condi- er branches of trees ...
Стр. 553
... quadrupeds , are undistinguishable at an early embryonic period , and that they become differen- tiated by insensibly fine steps . Embryo- logical resemblances of all kinds can be accounted for , as we shall hereafter see , by the ...
... quadrupeds , are undistinguishable at an early embryonic period , and that they become differen- tiated by insensibly fine steps . Embryo- logical resemblances of all kinds can be accounted for , as we shall hereafter see , by the ...
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The Origin of Species by Means of Natural Selection: Or, The ..., Том 1 Charles Darwin Полный просмотр - 1889 |
The Origin of Species by Means of Natural Selection: Or, the ..., Том 1 Charles Darwin Полный просмотр - 1898 |
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adapted advantage allied ants aphides appear Asa Gray avicularia beak become bees believe birds breeds caudicle cause cells characters cies climate closely color common crossed cuckoo degree descendants developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs exist extinct extremely facts favorable females fertile flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important increase individuals inhabitants inherited insects instance instinct intercrossing intermediate kind lamellæ lancelet large number larvæ lection less males manner Melipona Mivart modified natural selection naturalists nearly nest offspring organs perfect period pigeon plants pollen pollen-grains present prey principle probably produced progenitor quadrupeds rank rarely remarked resemble rieties rock-pigeon seeds sexes sexual sexual selection slight sometimes stamens striped structure struggle supposed swimbladder tend tendency tinct tion transitional trees variability variations varieties vary widely wings young