Darwinism Stated by Darwin Himself: Characteristic Passages from the Writings of Charles DarwinD. Appleton, 1890 - Всего страниц: 351 |
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Стр. 2
... position . For instance , the tendril of Cobæa first rises vertically up , with its branches divergent and with the terminal hooks turned outward ; the young shoot at the extremity of the stem is at the same time bent to one side , so ...
... position . For instance , the tendril of Cobæa first rises vertically up , with its branches divergent and with the terminal hooks turned outward ; the young shoot at the extremity of the stem is at the same time bent to one side , so ...
Стр. 3
... position in a glass of water in the dark , the extremity will , in a few hours , bend upward ; and , if the position of the shoot be then reversed , the downward - bent shoot reverses its curvature ; but if the stolon of a strawberry ...
... position in a glass of water in the dark , the extremity will , in a few hours , bend upward ; and , if the position of the shoot be then reversed , the downward - bent shoot reverses its curvature ; but if the stolon of a strawberry ...
Стр. 20
... position on the summit of the column . From the analogy of many plants we may in- fer that a long , spur - like nectary is primarily adapted to secrete and hold a store of nectar ; but in many orchids it has so far lost this function ...
... position on the summit of the column . From the analogy of many plants we may in- fer that a long , spur - like nectary is primarily adapted to secrete and hold a store of nectar ; but in many orchids it has so far lost this function ...
Стр. 21
... 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 from new sorts of in- sects visiting the flowers , it might be advantageous to the plant that 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 from new sorts of in- sects visiting the flowers , it might be advantageous to the plant that the ...
Стр. 22
... position by the ovarium being twisted twice as much as is usual . Again , we have seen that in most Vandeæ there is a plain relation between the depth of the stigmatic chamber and the length of the pedicel , by which the pollen - masses ...
... position by the ovarium being twisted twice as much as is usual . Again , we have seen that in most Vandeæ there is a plain relation between the depth of the stigmatic chamber and the length of the pedicel , by which the pollen - masses ...
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Darwinism Stated by Darwin Himself: Characteristic Passages from the ... Charles Darwin Полный просмотр - 1884 |
Darwinism Stated by Darwin Himself: Characteristic Passages from the ... Charles Darwin Полный просмотр - 1884 |
Darwinism stated by Darwin himself: Characteristic passages from the ... Charles Darwin Ограниченный просмотр - 2023 |
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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