Darwinism Stated by Darwin Himself: Characteristic Passages from the Writings of Charles DarwinD. Appleton, 1884 - Всего страниц: 351 |
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Стр. 2
... position . For instance , the tendril of Cobæa first rises vertically up , with its branches divergent and with the terminal hooks turned outward ; the young shoot at the extremity of the stem is at the same time bent to one side , so ...
... position . For instance , the tendril of Cobæa first rises vertically up , with its branches divergent and with the terminal hooks turned outward ; the young shoot at the extremity of the stem is at the same time bent to one side , so ...
Стр. 3
... position in a glass of water in the dark , the extremity will , in a few hours , bend upward ; and , if the position of the shoot be then reversed , the downward - bent shoot reverses its curvature ; but if the stolon of a strawberry ...
... position in a glass of water in the dark , the extremity will , in a few hours , bend upward ; and , if the position of the shoot be then reversed , the downward - bent shoot reverses its curvature ; but if the stolon of a strawberry ...
Стр. 20
... position on the summit of the column . From the analogy of many plants we may in- fer that a long , spur - like nectary is primarily adapted to secrete and hold a store of nectar ; but in many orchids it has so far lost this function ...
... position on the summit of the column . From the analogy of many plants we may in- fer that a long , spur - like nectary is primarily adapted to secrete and hold a store of nectar ; but in many orchids it has so far lost this function ...
Стр. 21
... position of a lower petal , so that insects can easily visit the flower ; but from slow changes in the form or position of the petals , or from new sorts of in- sects visiting the flowers , it might be advantageous to the plant that the ...
... position of a lower petal , so that insects can easily visit the flower ; but from slow changes in the form or position of the petals , or from new sorts of in- sects visiting the flowers , it might be advantageous to the plant that the ...
Стр. 22
... position by the ovarium being twisted twice as much as is usual . Again , we have seen that in most Vandea there is a plain relation between the depth of the stigmatic chamber and the length of the pedicel , by which the pollen - masses ...
... position by the ovarium being twisted twice as much as is usual . Again , we have seen that in most Vandea there is a plain relation between the depth of the stigmatic chamber and the length of the pedicel , by which the pollen - masses ...
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Darwinism Stated by Darwin Himself: Characteristic Passages from the ... Charles Darwin Полный просмотр - 1884 |
Darwinism Stated by Darwin Himself: Characteristic Passages from the ... Charles Darwin Полный просмотр - 1890 |
Darwinism stated by Darwin himself: Characteristic passages from the ... Charles Darwin Ограниченный просмотр - 2023 |
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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
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Стр. 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.
Стр. 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.
Стр. 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.
Стр. 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.
Стр. 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.
Стр. 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.
Стр. 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.