Darwinism Stated by Darwin Himself: Characteristic Passages from the Writings of Charles DarwinD. Appleton, 1884 - 351 من الصفحات |
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الصفحة 303
... ment of every organism ; but not necessarily during the continued existence of the same unit . Lastly , I assume that the gemmules in their dormant state have a mutual affinity for each other , leading to their aggregation into buds or ...
... ment of every organism ; but not necessarily during the continued existence of the same unit . Lastly , I assume that the gemmules in their dormant state have a mutual affinity for each other , leading to their aggregation into buds or ...
الصفحة 305
... ment as that of the being which has been operated on or bisected ; and in the case of buds , that the new beings thus produced are in the same stage as that of the bud- ding parent . Thus a mature salamander , of which the tail has been ...
... ment as that of the being which has been operated on or bisected ; and in the case of buds , that the new beings thus produced are in the same stage as that of the bud- ding parent . Thus a mature salamander , of which the tail has been ...
الصفحة 307
... ment ; but there is no reason to suppose that dormant gemmules can be transmitted and propagated forever . Excessively minute and numerous as they are believed to be , an infinite number , derived , during a long course of modification ...
... ment ; but there is no reason to suppose that dormant gemmules can be transmitted and propagated forever . Excessively minute and numerous as they are believed to be , an infinite number , derived , during a long course of modification ...
الصفحة 343
... ment ought to be lessened when we reflect that beings almost infinite in number , during an almost infinite lapse of time , have often had their whole organization rendered in some degree plastic , and that each slight modification of ...
... ment ought to be lessened when we reflect that beings almost infinite in number , during an almost infinite lapse of time , have often had their whole organization rendered in some degree plastic , and that each slight modification of ...
الصفحة 345
... ment were not predetermined for the builder's sake , can it be maintained with any greater probability that he specially ordained for the sake of the breeder each of the innumerable variations in our domestic animals and plants - many ...
... ment were not predetermined for the builder's sake , can it be maintained with any greater probability that he specially ordained for the sake of the breeder each of the innumerable variations in our domestic animals and plants - many ...
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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.