Darwinism Stated by Darwin Himself: Characteristic Passages from the Writings of Charles DarwinD. Appleton, 1884 - 351 من الصفحات |
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الصفحة 5
... highly sensitive to the slightest con- tinued pressure , and another highly sensitive to a slight momentary touch . The habit of moving at certain pe- riods is inherited both by plants and animals ; and several other points of ...
... highly sensitive to the slightest con- tinued pressure , and another highly sensitive to a slight momentary touch . The habit of moving at certain pe- riods is inherited both by plants and animals ; and several other points of ...
الصفحة 8
... highly beneficial ; but how could their sexual elements have been differen- tiated by exposure to different conditions ? If the progeni- tors of the two plants had lived on the same spot during the last score of generations , and had ...
... highly beneficial ; but how could their sexual elements have been differen- tiated by exposure to different conditions ? If the progeni- tors of the two plants had lived on the same spot during the last score of generations , and had ...
الصفحة 9
... highly fertile . Seedlings from a cross of this kind grow with great vigor , and trans- mit their vigor to their descendants . These , therefore , in the struggle for life , will generally beat and exterminate the seedlings from plants ...
... highly fertile . Seedlings from a cross of this kind grow with great vigor , and trans- mit their vigor to their descendants . These , therefore , in the struggle for life , will generally beat and exterminate the seedlings from plants ...
الصفحة 12
... highly ser- viceable as a means of dissemination , but we now know that fertile eggs can be produced without the aid of the male . There are also many other methods by which organisms can be propagated asexually . Why then have the two ...
... highly ser- viceable as a means of dissemination , but we now know that fertile eggs can be produced without the aid of the male . There are also many other methods by which organisms can be propagated asexually . Why then have the two ...
الصفحة 14
... highly complex organization ; and that at the same time there was no need for all the individuals to produce young , and conse- quently that no injury , on the contrary , good 14 DARWINISM STATED BY DARWIN HIMSELF . Why the Sexes have ...
... highly complex organization ; and that at the same time there was no need for all the individuals to produce young , and conse- quently that no injury , on the contrary , good 14 DARWINISM STATED BY DARWIN HIMSELF . Why the Sexes have ...
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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 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
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.