Darwinism Stated by Darwin Himself: Characteristic Passages from the Writings of Charles DarwinD. Appleton, 1890 - Всего страниц: 351 |
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... Checks to Increase .. . 85 Climate as a Check to Increase Influence of Insects in the Struggle for Existence No such Thing as Change in the Result of the Struggle . 86 . 88 90 V. NATURAL SELECTION ; OR , THE SURVIVAL OF THE. X CONTENTS .
... Checks to Increase .. . 85 Climate as a Check to Increase Influence of Insects in the Struggle for Existence No such Thing as Change in the Result of the Struggle . 86 . 88 90 V. NATURAL SELECTION ; OR , THE SURVIVAL OF THE. X CONTENTS .
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... insects to a considerable distance from plant to plant . Therefore , one of the parents or ancestors of our two plants of Digitalis may have been crossed by a dis- tant plant growing under somewhat different condi- tions . Plants thus ...
... insects to a considerable distance from plant to plant . Therefore , one of the parents or ancestors of our two plants of Digitalis may have been crossed by a dis- tant plant growing under somewhat different condi- tions . Plants thus ...
Стр. 10
... insects or the wind , it would be an incomparably better plan to obtain seeds of the required variety , which had been raised for some generations under as different conditions as possible , and Sow them in alternate rows with seeds ...
... insects or the wind , it would be an incomparably better plan to obtain seeds of the required variety , which had been raised for some generations under as different conditions as possible , and Sow them in alternate rows with seeds ...
Стр. 18
... Insects , page 245 . It is interesting to look at one of the mag- nificent exotic species ( orchids ) , or , indeed , at one of our humblest forms , and observe how profoundly it has been modified , as compared with all ordinary flowers ...
... Insects , page 245 . It is interesting to look at one of the mag- nificent exotic species ( orchids ) , or , indeed , at one of our humblest forms , and observe how profoundly it has been modified , as compared with all ordinary flowers ...
Стр. 19
... insects to another flower ; and the anther opens widely in order that the pollinium should be easily withdrawn ; but , in the Bee ophrys , the caudicle , by a slight increase in length and decrease in its thickness , and by the anther ...
... insects to another flower ; and the anther opens widely in order that the pollinium should be easily withdrawn ; but , in the Bee ophrys , the caudicle , by a slight increase in length and decrease in its thickness , and by the anther ...
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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