Darwinism: An Exposition of the Theory of Natural Selection, with Some of Its ApplicationsMacmillan and Company, 1889 - 494 pages |
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Page 42
... length into the various proofs of variation in a state of nature . This is the more necessary because the materials collected by Mr. Darwin bearing on this question have never been published , and comparatively few of them have been ...
... length into the various proofs of variation in a state of nature . This is the more necessary because the materials collected by Mr. Darwin bearing on this question have never been published , and comparatively few of them have been ...
Page 43
... length of the tentacles , the form of the disc and of the mouth , and the character of surface of the column , while the colour varies enormously in a great number of the species . Similar variations occur in all the various groups of ...
... length of the tentacles , the form of the disc and of the mouth , and the character of surface of the column , while the colour varies enormously in a great number of the species . Similar variations occur in all the various groups of ...
Page 46
... length of the head as a standard , he finds the neck , trunk , tail , front and hind legs , colour , and femoral ... length of the body of the fourteen specimens being two inches . The respective lengths of the neck , legs , and toe of ...
... length of the head as a standard , he finds the neck , trunk , tail , front and hind legs , colour , and femoral ... length of the body of the fourteen specimens being two inches . The respective lengths of the neck , legs , and toe of ...
Page 47
... length . 2in . Neck . Mean length . 1.18in . Fore Leg .. Mean length . 1.05in . Hind Leg . Mean length . 1.90in . Toe of Hind Foot_ Mean length . 0.70in . 7 3 5 7 9 11 14 1 3 5 9 11 14 The lengths in the table are given in millimetres ...
... length . 2in . Neck . Mean length . 1.18in . Fore Leg .. Mean length . 1.05in . Hind Leg . Mean length . 1.90in . Toe of Hind Foot_ Mean length . 0.70in . 7 3 5 7 9 11 14 1 3 5 9 11 14 The lengths in the table are given in millimetres ...
Page 48
... Hind Legs Tail Neck Body Lacerta deserti Hind Legs Tail Length of Head taken as the standard in each of the above - named species FIG . 2. Variation of Lizards . each specimen are then laid down in the same manner 48 CHAP . 88 DARWINISM.
... Hind Legs Tail Neck Body Lacerta deserti Hind Legs Tail Length of Head taken as the standard in each of the above - named species FIG . 2. Variation of Lizards . each specimen are then laid down in the same manner 48 CHAP . 88 DARWINISM.
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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 concealment conspicuous continued cross-fertilisation crossed curious Darwin dicotyledons distinct species domestic animals effects eggs enemies Eocene evidence extinct facts faculty favourable female fertile fertilisation flowers genera genus geological groups habits hybrids illustration important increase individuals infertility inhabit insects intercrossing kind 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 protectively coloured pupa races regions remarkable resemble seeds self-fertilisation Silurian similar specimens spots sterility structure struggle for existence supposed tail theory tints tion toes trees tropical usually variability variation varied varieties vegetation warning colours whole wild wings Zealand
Popular passages
Page 337 - 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.
Page 478 - 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.
Page 40 - 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.
Page 412 - 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...
Page 474 - The special faculties we have been discussing clearly point to the existence in man of something which he has not derived from his animal progenitors — something which we may best refer to as being of a spiritual essence or nature, capable of progressive development under favourable conditions.
Page 38 - 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.
Page 31 - 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.
Page 31 - 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...
Page 265 - That the imitative species occur in the same area and occupy the same station as the imitated. (2) That the imitators are always the more defenceless. (3) That the imitators "are always less numerous in individuals. ( 4 ) That the imitators differ from the bulk of their allies. (5) That the imitation, however minute, is external and visible only, never extending to internal characters or to such as do not affect the external appearance.
Page 476 - 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.