Darwinism Stated by Darwin Himself: Characteristic Passages from the Writings of Charles DarwinD. Appleton, 1884 - 351 من الصفحات |
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الصفحة 301
... gemmules of the transposed organs become developed in the wrong place , from uniting with wrong cells or aggregates of cells during their nascent state ; and this would follow from a slight modification in their elective affinities . On ...
... gemmules of the transposed organs become developed in the wrong place , from uniting with wrong cells or aggregates of cells during their nascent state ; and this would follow from a slight modification in their elective affinities . On ...
الصفحة 303
... gemmules . They are collected from all parts of the system to constitute the sexual elements , and their development in the next generation forms a new being ; but they are likewise capable of transmission in a dormant state to future ...
... gemmules . They are collected from all parts of the system to constitute the sexual elements , and their development in the next generation forms a new being ; but they are likewise capable of transmission in a dormant state to future ...
الصفحة 304
... gemmules , which can hardly differ much in nature from the lowest and simplest organisms , render it improbable that they should grow and multiply . A great authority , Dr. Beale , says that " minute yeast - cells are capable of ...
... gemmules , which can hardly differ much in nature from the lowest and simplest organisms , render it improbable that they should grow and multiply . A great authority , Dr. Beale , says that " minute yeast - cells are capable of ...
الصفحة 305
... gemmules do not ordinarily spread from bud to bud , but are confined to the parts developed from each separate bud ... gemmules derived from every part or unit of the earlier stages of development ; and why do not such gemmules ...
... gemmules do not ordinarily spread from bud to bud , but are confined to the parts developed from each separate bud ... gemmules derived from every part or unit of the earlier stages of development ; and why do not such gemmules ...
الصفحة 306
... gemmules are retained for this special purpose either locally or throughout the body , ready to combine with the gem- mules derived from the cells which come next in due succession . If this be admitted , we have a sufficient answer to ...
... gemmules are retained for this special purpose either locally or throughout the body , ready to combine with the gem- mules derived from the cells which come next in due succession . If this be admitted , we have a sufficient answer to ...
المحتوى
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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.