The Darwinian Theory of the Transmutation of SpeciesJ. Nisbet, 1867 - Всего страниц: 386 |
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Стр. 8
... perfect certainty ; nay, even a tail- feather will be sufficient for a person well versed in the subject, to say to what genus and species the bird from which it has been taken belongs. I mention this fact to show that what we designate ...
... perfect certainty ; nay, even a tail- feather will be sufficient for a person well versed in the subject, to say to what genus and species the bird from which it has been taken belongs. I mention this fact to show that what we designate ...
Стр. 8
... perfect certainty ; nay , even a tail- feather will be sufficient for a person well versed in the subject , to say to what genus and species the bird from which it has been taken belongs . I mention this fact to show that what we ...
... perfect certainty ; nay , even a tail- feather will be sufficient for a person well versed in the subject , to say to what genus and species the bird from which it has been taken belongs . I mention this fact to show that what we ...
Стр. 21
... perfect a denial of the theory of transmutation as words can express . ] 5. The intermixture of the distinct species is guarded against by the aversion of the individuals composing them to sexual union , or by the sterility of the male ...
... perfect a denial of the theory of transmutation as words can express . ] 5. The intermixture of the distinct species is guarded against by the aversion of the individuals composing them to sexual union , or by the sterility of the male ...
Стр. 25
... perfect acquaintance with all regions of the earth , much yet will have to be re - cast and re - arranged , when the importation of additional know- ledge into the hive of science shall call for the renewed labours of the workmen . Let ...
... perfect acquaintance with all regions of the earth , much yet will have to be re - cast and re - arranged , when the importation of additional know- ledge into the hive of science shall call for the renewed labours of the workmen . Let ...
Стр. 38
... perfect , and in hybrids imperfect ' ( 268 ) . That ster- ility , both of first crosses and of hybrids , is simply inci- dental , or dependent on unknown differences , chiefly in the reproductive system of the species which are crossed ...
... perfect , and in hybrids imperfect ' ( 268 ) . That ster- ility , both of first crosses and of hybrids , is simply inci- dental , or dependent on unknown differences , chiefly in the reproductive system of the species which are crossed ...
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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
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Стр. 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.
Стр. 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.
Стр. 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.
Стр. 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.
Стр. 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.
Стр. 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.
Стр. 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.
Стр. 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.
Стр. 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.
Стр. 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.