Darwinism: An Exposition of the Theory of Natural Selection with Some of Its ApplicationsMacmillan, 1901 |
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Стр. 13
... experiments , the record of a portion of which he has given us in a series of twelve masterly volumes . Proposed Mode of Treatment of the Subject . It is evidently of the most vital importance to any theory that its foundations should ...
... experiments , the record of a portion of which he has given us in a series of twelve masterly volumes . Proposed Mode of Treatment of the Subject . It is evidently of the most vital importance to any theory that its foundations should ...
Стр. 74
... experiments in diagram - making , that no better method can be adopted for bringing before the eye , both the amount and the peculiar features of individual variability . Variations of the Habits of Animals . Closely connected with ...
... experiments in diagram - making , that no better method can be adopted for bringing before the eye , both the amount and the peculiar features of individual variability . Variations of the Habits of Animals . Closely connected with ...
Стр. 125
... experiment . Two of these will be briefly described . 1 In his presidential address to the Zoological Section of the British Association in 1898 , Professor W. F. R. Weldon described experiments made during three separate years on a ...
... experiment . Two of these will be briefly described . 1 In his presidential address to the Zoological Section of the British Association in 1898 , Professor W. F. R. Weldon described experiments made during three separate years on a ...
Стр. 125
... Experiments of this kind are still going on ; every precaution is being taken to secure trustworthy results ; and ... experiment has recently been made in America with equally interesting results . In February 1898 , after a very severe ...
... Experiments of this kind are still going on ; every precaution is being taken to secure trustworthy results ; and ... experiment has recently been made in America with equally interesting results . In February 1898 , after a very severe ...
Стр. 156
... experiments that have been made . on the hybridisation of plants similar peculiarities have been noticed , some individuals being capable , others incapable , of being crossed with a distinct species . The same individual peculiarities ...
... experiments that have been made . on the hybridisation of plants similar peculiarities have been noticed , some individuals being capable , others incapable , of being crossed with a distinct species . The same individual peculiarities ...
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abundant adapted adduced allied species America amount animals and plants appears birds breed brilliant butterflies carnivora cause characters climate closely allied colours of animals common conspicuous continued cross-fertilisation crossed curious Darwin dicotyledons distinct species domestic animals effects eggs enemies Eocene evidence explained extinct facts faculty favourable female fertile fertilised flowers genera genus geological groups habits hybrids important increase individuals infertility insects intercrossing kind large number larvæ less living male mammalia mammals markings marsupials mimicry Miocene mode modified moths natural selection naturalists nests occur offspring organs Origin of Species peculiar pigeons Pliocene pollen portion possess probably produced Professor proportion protectively coloured pupa regions remarkable resemblance seeds self-fertilisation Silurian specimens spots sterility structure struggle for existence supposed surface tail theory tints tion toes trees tropical usually variability variation varied varieties vegetation warning colours whole wild wings Zealand
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Стр. 335 - FLOWER in the crannied wall, I pluck you out of the crannies, I hold you here, root and all, in my hand, Little flower — but if I could understand What you are, root and all, and all in all, I should know what God and man is.
Стр. 130 - Nevertheless, I did not formerly consider sufficiently the existence of structures, which, as far as we can at present judge, are neither beneficial nor injurious; and this I believe to be one of the greatest oversights as yet detected in my work.
Стр. 476 - That life is not as idle ore, But iron dug from central gloom, And heated hot with burning fears, And dipt in baths of hissing tears, And batter'd with the shocks of doom To shape and use.
Стр. 38 - When we reflect on this struggle, we may console ourselves with the full belief, that the war of nature is not incessant, that no fear is felt, that death is generally prompt, and that the vigorous, the healthy, and the happy survive and multiply.
Стр. 410 - I have now recapitulated the facts and considerations which have thoroughly convinced me that species have been modified during a long course of descent. This has been effected chiefly through the natural selection of numerous successive, slight, favourable variations; aided in an important manner by the inherited effects of the use and disuse of parts; and in an unimportant manner, that is in relation to adaptive structures, whether past or present, by the direct action of external conditions, and...
Стр. 36 - Starting, and looking half round, I saw the lion just in the act of springing upon me. I was upon a little height ; he caught my shoulder as he sprang, and we both came to the ground below together. Growling horribly close to my ear, he shook me as a terrier dog does a rat.
Стр. 449 - Not being able to appreciate or conceive of the distinction between the psychical phenomena of a Chimpanzee and of a Boschisman or of an Aztec, with arrested brain growth, as being of a nature so essential as to preclude a comparison between them, or as being other than a difference of degree, I cannot shut my eyes to the significance of that all"pervading similitude of structure — every tooth, every bone, strictly homologous — which makes the determination of the difference between Homo and...
Стр. 29 - Not far from Shelbyville, in the State of Kentucky, about five years ago, there was one of these breeding places, which stretched through the woods in nearly a north and south direction ; was several miles in breadth, and was said to be upwards of forty miles in extent ! In this tract, almost every tree was furnished with nests, wherever the branches could accommodate them.
Стр. 30 - I was astonished at their appearance. They were flying with great steadiness and rapidity, at a height beyond gunshot, in several strata deep, and so close together, that could shot have reached them, one discharge could not have failed of bringing down several individuals. From right to left as far as the eye could reach, the breadth of this vast procession extended ; seeming everywhere equally crowded.
Стр. 17 - Paraguay, the parasitic insects would probably increase; and this would lessen the number of the navel-frequenting flies — then cattle and horses would become feral, and this would certainly greatly alter (as indeed I have observed in parts of South America) the vegetation: this again would largely affect the insects; and this, as we have just seen in Staffordshire, the insectivorous birds, and so onwards in ever-increasing circles of complexity.