The Darwinian Theory of the Transmutation of Species |
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Page 19
... sterility of hybrids is this barrier , —a fact generally admitted by na- turalists . Such are the observations and deductions of learned phy- siologists ; but the question is nevertheless one of common observation , and would be ...
... sterility of hybrids is this barrier , —a fact generally admitted by na- turalists . Such are the observations and deductions of learned phy- siologists ; but the question is nevertheless one of common observation , and would be ...
Page 21
... sterility of the male offspring . It does not appear that true hybrid races have ever been perpetuated for several generations , even by the assistance of man ; for the cases usually cited relate to the crossing of mules with ...
... sterility of the male offspring . It does not appear that true hybrid races have ever been perpetuated for several generations , even by the assistance of man ; for the cases usually cited relate to the crossing of mules with ...
Page 27
... sterility discussed , and , as it will be seen , with ingenious manage- ment . First , however , it will be important to notice the con- cessions made to the question of sterility of hybrid animals : ' I doubt whether any case of a ...
... sterility discussed , and , as it will be seen , with ingenious manage- ment . First , however , it will be important to notice the con- cessions made to the question of sterility of hybrid animals : ' I doubt whether any case of a ...
Page 28
... sterility of hybrids . Nor do I pretend that the foregoing remarks go to the root of the matter : no explanation is offered why an organism , when placed under unnatural conditions , is rendered sterile ( 288 ) . If this explanation ...
... sterility of hybrids . Nor do I pretend that the foregoing remarks go to the root of the matter : no explanation is offered why an organism , when placed under unnatural conditions , is rendered sterile ( 288 ) . If this explanation ...
Page 29
... sterile . ' In these words lurks the unintended avowal that there are certain pre - existing conditions of nature , that nature has prescribed certain organisms to carry out certain functions , and that an attempt to divert the func ...
... sterile . ' In these words lurks the unintended avowal that there are certain pre - existing conditions of nature , that nature has prescribed certain organisms to carry out certain functions , and that an attempt to divert the func ...
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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.