Darwinism Stated by Darwin Himself: Characteristic Passages from the Writings of Charles DarwinD. Appleton, 1890 - Всего страниц: 351 |
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Стр. 13
... sometimes separated . As with many of the lowest plants and ani- mals the conjugation of two individuals , which are either quite similar or in some degree different is a common phenomenon , it seems probable , as remarked in the last ...
... sometimes separated . As with many of the lowest plants and ani- mals the conjugation of two individuals , which are either quite similar or in some degree different is a common phenomenon , it seems probable , as remarked in the last ...
Стр. 21
... sometimes the foot- stalk ) becomes for a period twisted , causing the labellum to assume the position of a lower petal , so that insects can easily visit the flower ; but from slow changes in the form or position of the petals , or ...
... sometimes the foot- stalk ) becomes for a period twisted , causing the labellum to assume the position of a lower petal , so that insects can easily visit the flower ; but from slow changes in the form or position of the petals , or ...
Стр. 25
... sometimes effected by singularly complicated movements . This fact suggests that the upper surface requires more protection than the lower one . For instance , the ter- minal leaflet in trifolium , after turning up at night so as to ...
... sometimes effected by singularly complicated movements . This fact suggests that the upper surface requires more protection than the lower one . For instance , the ter- minal leaflet in trifolium , after turning up at night so as to ...
Стр. 30
... sometimes thus carried tempo- rarily beyond an upright position . The benefits derived from geotropism , apogeotropism , and diageotropism , are generally so manifest that they need not be specified . With the flower - peduncles of ...
... sometimes thus carried tempo- rarily beyond an upright position . The benefits derived from geotropism , apogeotropism , and diageotropism , are generally so manifest that they need not be specified . With the flower - peduncles of ...
Стр. 32
... sometimes doubt- ful tinge of red . Two other old leaves , however , which appeared to have been inflected several times , acted much more decidedly on the paper . Particles of clean glass were then placed on five of the leaves , cubes ...
... sometimes doubt- ful tinge of red . Two other old leaves , however , which appeared to have been inflected several times , acted much more decidedly on the paper . Particles of clean glass were then placed on five of the leaves , cubes ...
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acid acquired action adapted admit allied animals apes appear become believe birds body breeds cause character climate closely compared cotyledons crossed degree descended developed distinct species disuse domestic doubt early effects eggs embryo existence extinct eyes fact female fertilization forms gemmules genera genus geotropism Glacial habits hairs hermaphrodites highly horses increase individuals inhabitants inherited insects instance instincts islands kinds labellum lancelet larvæ leaves less living lower animals Malaxis paludosa males mammals manner mental millimetre modified monkeys movements muscles natural selection naturalists observed occasionally offspring organs Origin of Species ovules papillæ parent peculiar period pigeon plants points pollen pollinium possess present prey probably produced progenitors Quadrumana quadrupeds races radicles remarkable resemble rudimentary savages seedlings seeds seems sexes sexual elements sexual selection slight structure suppose surface tend tendency tion transmitted utricle variability variations varieties various vertebræ whole wild worms young