Darwinism Stated by Darwin Himself: Characteristic Passages from the Writings of Charles DarwinD. Appleton, 1884 - 351 من الصفحات |
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الصفحة x
... 84 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 .
... 84 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 .
الصفحة 9
... 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 ...
الصفحة 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 ...
الصفحة 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 ...
الصفحة 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 insects to another flower ; and the anther opens widely in order that the pollinium should be easily withdrawn ; but , in the Bee ophrys , the caudicle , by a slight increase in length and decrease in its thickness , and by the anther ...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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عبارات ومصطلحات مألوفة
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 increase individuals inhabitants inherited insects instance intermediate islands kind labellum lancelet language larvæ laws 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
مقاطع مشهورة
الصفحة i - There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being evolved.
الصفحة 347 - It is interesting to contemplate an entangled bank, clothed with many plants of many kinds, with birds singing on the bushes, with various insects flitting about, and with worms crawling through the damp earth, and to reflect that these elaborately constructed forms, so different from each other, and dependent upon each other in so complex a manner, have all been produced by laws acting around us.
الصفحة 110 - To suppose that the eye, with all its inimitable contrivances for adjusting the focus to different distances, for admitting different amounts of light, and for the correction of spherical and chromatic aberration, could have been formed by natural selection, seems, I freely confess, absurd in the highest possible degree.
الصفحة 72 - The key is man's power of accumulative selection: nature gives successive variations; man adds them up in certain directions useful to him. In this sense he may be said to have made for himself useful breeds.
الصفحة 254 - It is incredible that all these facts should speak falsely. He who is not content to look, like a savage, at the phenomena of nature as disconnected, cannot any longer believe that man is the work of a separate act of creation.
الصفحة 44 - It may be doubted whether there are many other animals which have played so important a part in the history of the world, as have these lowly organised creatures.
الصفحة 308 - But as my conclusions have lately been much misrepresented, and it has been stated that I attribute the modification of species exclusively to natural selection, I may be permitted to remark that in the first edition of this work, and subsequently, I placed in a most conspicuous position — namely, at the close of the Introduction — the following words: "I am convinced that natural selection has been the main but not thé exclusive means of modification.