Darwinism: An Exposition of the Theory of Natural Selection, with Some of Its ApplicationsMacmillan and Company, 1890 - Всего страниц: 494 |
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Стр. 5
... specimens must have been introduced in numbers capable of maintaining their normal proportions to those which live isolated and are comparatively and constantly fewer . For we know that this harmony in the numerical proportions between ...
... specimens must have been introduced in numbers capable of maintaining their normal proportions to those which live isolated and are comparatively and constantly fewer . For we know that this harmony in the numerical proportions between ...
Стр. 35
... specimen of any particular species which he has noticed . Even the forests of the temperate zones , in all favourable situations , exhibit a considerable variety of trees of distinct genera and families , and it is only when we approach ...
... specimen of any particular species which he has noticed . Even the forests of the temperate zones , in all favourable situations , exhibit a considerable variety of trees of distinct genera and families , and it is only when we approach ...
Стр. 41
... . Now , however , a collection is valued in proportion as it contains illustrative specimens of all the varieties that occur in each species , and in some cases these have been carefully described , so that we possess a.
... . Now , however , a collection is valued in proportion as it contains illustrative specimens of all the varieties that occur in each species , and in some cases these have been carefully described , so that we possess a.
Стр. 42
... specimens as have passed under the review of Messrs . Williamson , Parker , Rupert Jones , and myself in our studies of the types of this group ; ' and he states as the result of this extensive comparison of " } specimens : " The range ...
... specimens as have passed under the review of Messrs . Williamson , Parker , Rupert Jones , and myself in our studies of the types of this group ; ' and he states as the result of this extensive comparison of " } specimens : " The range ...
Стр. 43
... specimens : " The range of variation is so great among the Foraminifera as to include not merely those differential char- acters which have been usually accounted specific , but also those upon which the greater part of the genera of ...
... specimens : " The range of variation is so great among the Foraminifera as to include not merely those differential char- acters which have been usually accounted specific , but also those upon which the greater part of the genera of ...
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abundant adapted adduced allied species amount animals and plants appears become birds breed brilliant butterflies carnivora cause characters closely allied colours and markings colours of animals common concealment conspicuous crossed curious Darwin distinct species divergence domestic animals effects eggs enemies Eocene evidence explain facts favourable female fertile fertilised flowers genera genus geological groups habits hybrids illustration imitation important increase inedible infertility insects intercrossing islands larva larvæ length less living male mammalia mammals man-The mimicry Miocene mode modified moths natural selection naturalists nests occur oceanic offspring organisms Origin of Species pair peculiar pigeons plumage probably produced protectively coloured pupa races remarkable resemblance seeds sexes sexual similar South America specimens spots sterility structure struggle for existence sun-birds supposed tail theory tints tion titmouse trees tropical usually variability variation varied varieties vegetation warning colours whole wild wings
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Стр. 418 - 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. 14 - 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. 100 - 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. 359 - 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. 12 - 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. 393 - 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. 7 - 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. 7 - 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. 7 - The ground was strewed with broken limbs of trees, eggs, and young squab pigeons, which had been precipitated from above, and on which herds of hogs were fattening. Hawks, buzzards, and eagles, were sailing about in great numbers, and seizing the squabs from...
Стр. 416 - These three distinct stages of progress from the inorganic world of matter and motion up to man, point clearly to an unseen universe — to a world of spirit, to which the world of matter is altogether subordinate.