Darwinism Stated by Darwin Himself: Characteristic Passages from the Writings of Charles DarwinD. Appleton, 1884 - Всего страниц: 351 |
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... Obscure Checks to Increase 85 • Climate as a Check to Increase 86 Influence of Insects in the Struggle for Existence 88 No such Thing as Change in the Result of the Struggle . 90 V. NATURAL SELECTION ; OR , THE SURVIVAL OF THE X CONTENTS .
... Obscure Checks to Increase 85 • Climate as a Check to Increase 86 Influence of Insects in the Struggle for Existence 88 No such Thing as Change in the Result of the Struggle . 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 ...
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... 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 insects to another flower ; and the anther opens widely in order that the pollinium should be easily withdrawn ; but , in the Bee ophrys , the caudicle , by a slight increase in length and decrease in its thickness , and by the anther ...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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acquired action admit allied apes appear Asa Gray become believe birds blush body breeds Catarrhine cause characters closely Cloth Darwin degree descended developed distinct species domestic doubt early effects eggs existence expression extinct eyes fact favorable feel females fertilization forms gemmules genera geotropism habit hair HERBERT SPENCER hermaphrodites highly horse Illustrations increase individuals inhabitants inherited insects instance intermediate islands kind labellum lancelet language larvæ less living lower animals males mammals manner ment mental mind modified monkeys movements muscles natural selection naturalists observed offspring organic Origin of Species papillæ parent peculiar period plants pollen possess present principle probably produced Professor progenitors Quadrumana quadrupeds races remarkable resemble rudimentary savages seeds seems seen sexes sexual selection slight South America structure suppose T. H. HUXLEY tend tendency tion transmitted utricle variability variations varieties various vertebræ whole wild worms young