The Darwinian Theory of the Transmutation of Species |
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Page 20
... modification of the form , colour , size , structure , or other particulars ; but the mutations thus superinduced are governed by constant laws , and the capability of so varying form part of the spe- cific character . 3. Some acquired ...
... modification of the form , colour , size , structure , or other particulars ; but the mutations thus superinduced are governed by constant laws , and the capability of so varying form part of the spe- cific character . 3. Some acquired ...
Page 32
... modification of structure or instinct , correlated with the sterile condition of certain members of the community , has been advan- tageous to the community : consequently the fertile males and females of the same community flourished ...
... modification of structure or instinct , correlated with the sterile condition of certain members of the community , has been advan- tageous to the community : consequently the fertile males and females of the same community flourished ...
Page 40
... modification of their existing organization would be for their benefit , the change has been effected by very slow degrees , gradually and imperceptibly advancing towards the beneficial point ; and the changes , however minute ...
... modification of their existing organization would be for their benefit , the change has been effected by very slow degrees , gradually and imperceptibly advancing towards the beneficial point ; and the changes , however minute ...
Page 42
... modifications of instinct to any extent in any useful direction ' ( 265 ) . Natural Selection , on the principle of ... modification of their structure ' ( 101 ) . In other words , if Mr Darwin's theory be true , we have done with the ...
... modifications of instinct to any extent in any useful direction ' ( 265 ) . Natural Selection , on the principle of ... modification of their structure ' ( 101 ) . In other words , if Mr Darwin's theory be true , we have done with the ...
Page 56
... modifications , each better and better , for so trifling an object as driving away flies ; yet we should pause before being too positive even in this case , for we know that the distribution and existence of cattle and other animals in ...
... modifications , each better and better , for so trifling an object as driving away flies ; yet we should pause before being too positive even in this case , for we know that the distribution and existence of cattle and other animals in ...
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Common terms and phrases
advance ages algæ amongst ancient antecedent appear beauty bees believe birds blood bones character contrivances creation creatures crustacean Cuvier Darwin Darwin's Theory descendants distinct earth effected elephant Eocene existence exterminated fact favoured female fishes foot formation genera geology giraffe gorilla habits heart horse human hybrid improvement insects instance instinct intellect Lamarck learned limbs living lower Lyell male means ment metaphor millions modification mutation Natural Selection naturalists negative evidence never object observed organic Origin of Species passage perfect physiologists plants prehensile principle produced Professor progenitor proof quadrupeds race racter red clover reptiles rocks says seems sequence of events Silurian soil spore sterility structure struggle suppose tail tapir Tertiary Theory of Transmutation things tion transformation TRANSMUTATION OF SPECIES Transmutationists Trémaux Trilobite variations varieties vertebral column vertebrata vertebrated animals whale whole wings words
Popular passages
Page 7 - And God made the beast of the earth after his kind, and cattle after their kind, and every thing that creepeth upon the earth after his kind: and God saw that it was good.
Page 52 - Under changed conditions of life, it is at least possible that slight modifications of instinct might be profitable to a species; and if it can be shown that instincts do vary ever so little, then I can see no difficulty in natural selection preserving and continually accumulating variations of instinct to any extent that was profitable. It is thus, as I believe, that all the most complex and wonderful instincts have originated.
Page 7 - And God said, Let the earth bring forth grass, the herb yielding seed and the fruit tree yielding fruit after his kind, whose seed is in itself, upon the earth: and it was so. And the earth brought forth grass, and herb yielding seed after his kind, and the tree yielding fruit, whose seed was in itself, after his kind: and God saw that it was good.
Page 27 - So again it is difficult to avoid personifying the word Nature ; but I mean by Nature, only the aggregate action and product of many natural laws, and by laws the sequence of events as ascertained by us.
Page xiii - In short, we shall have to treat species in the same manner as those naturalists treat genera, who admit that genera are merely artificial combinations made for convenience. This may not be a cheering prospect ; but we shall at least be freed from the vain search for the undiscovered and undiscoverable essence of the term species.
Page 113 - I can see no difficulty in a race of bears being rendered, by natural selection, more and more aquatic in their structure and habits, with larger and larger mouths, till a creature was produced as monstrous as a whale.
Page 43 - The similar framework of bones in the hand of a man, wing of a bat, fin of the porpoise, and leg of the horse, — the same number of vertebrae forming the neck of the giraffe and of the elephant, — and innumerable other such facts, at once explain themselves on the theory of descent with slow and slight successive modifications.
Page xi - These facts, as will be seen in the latter chapters of this volume, seemed to throw some light on the origin of species — that mystery of mysteries, as it has been called by one of our greatest philosophers.
Page 221 - 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.
Page 26 - Slow though the process of selection may be, if feeble man can do much by his powers of artificial selection, I can see no limit to the amount of change, to the beauty and infinite complexity of the coadaptations between all organic beings, one with another and with their physical conditions of life, which may be effected in the long course of time by nature's power of selection.