Darwinism Stated by Darwin Himself: Characteristic Passages from the Writings of Charles DarwinD. Appleton, 1884 - 351 من الصفحات |
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الصفحة x
... produced . Unconscious Selection Adaptation of Animals to the Fancies of Man Doubtful Species . Species an Arbitrary Term 66 67 68 69 71 • 73 74 75 77 The True Plan of Creation 79 IV . THE STRUGGLE FOR EXISTENCE . Death inevitable in ...
... produced . Unconscious Selection Adaptation of Animals to the Fancies of Man Doubtful Species . Species an Arbitrary Term 66 67 68 69 71 • 73 74 75 77 The True Plan of Creation 79 IV . THE STRUGGLE FOR EXISTENCE . Death inevitable in ...
الصفحة 7
... produce offspring , though the confinement may be far from close ; and of plants ren- dered sterile by cultivation . But hardly any cases afford more striking evidence how powerfully a change in the conditions of life acts on the sexual ...
... produce offspring , though the confinement may be far from close ; and of plants ren- dered sterile by cultivation . But hardly any cases afford more striking evidence how powerfully a change in the conditions of life acts on the sexual ...
الصفحة 8
... produced flower - stems in number as 100 to 47 , and in average height as 100 to 70. Therefore , the cross between these two plants was highly beneficial ; but how could their sexual elements have been differen- tiated by exposure to ...
... produced flower - stems in number as 100 to 47 , and in average height as 100 to 70. Therefore , the cross between these two plants was highly beneficial ; but how could their sexual elements have been differen- tiated by exposure to ...
الصفحة 9
... produce an unusually large number of seeds ; a striking instance of this fact is afforded by the Bignonia , which was fertilized by Fritz Müller with pollen from some adjoining plants and set hardly any seed , but , when fertilized with ...
... produce an unusually large number of seeds ; a striking instance of this fact is afforded by the Bignonia , which was fertilized by Fritz Müller with pollen from some adjoining plants and set hardly any seed , but , when fertilized with ...
الصفحة 12
... 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 sexes been developed , and why do males exist which can not themselves produce offspring ...
... 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 sexes been developed , and why do males exist which can not themselves produce offspring ...
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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.