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. 501
... lection to enlarge or to reduce the wings , would depend on whether a greater num- ber of individuals were saved by success- fully battling with the winds , or by giving up the attempt and rarely or never flying . As with mariners ...
... lection to enlarge or to reduce the wings , would depend on whether a greater num- ber of individuals were saved by success- fully battling with the winds , or by giving up the attempt and rarely or never flying . As with mariners ...
Стр. 532
... lection . 309. We have in this chapter discussed some of the difficulties and objections which may be urged against the theory . Many of them are serious ; but I think that in the discussion light has been thrown on several facts ...
... lection . 309. We have in this chapter discussed some of the difficulties and objections which may be urged against the theory . Many of them are serious ; but I think that in the discussion light has been thrown on several facts ...
Стр. 570
... lection , and likewise because this is by far some few other facts in regard to instincts ; the most serious special difficulty which as by that common case of closely allied , my theory has encountered . The case , but distinct ...
... lection , and likewise because this is by far some few other facts in regard to instincts ; the most serious special difficulty which as by that common case of closely allied , my theory has encountered . The case , but distinct ...
Другие издания - Просмотреть все
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