A Primer of Darwinism and Organic Evolution |
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The reader who wishes to find the principal objections to the sufficiency of the natural selection hypothesis stated in detail , may look for them in the writings of Mivart , Cope . Hyatt , Packard , and Henslow ...
The reader who wishes to find the principal objections to the sufficiency of the natural selection hypothesis stated in detail , may look for them in the writings of Mivart , Cope . Hyatt , Packard , and Henslow ...
Page 15
And this he would do simply by going over the herd , and selecting for breeding just those animals which had the qualities desired , allowing no others to breed . The tendency of plants to sport has already been mentioned , and such a ...
And this he would do simply by going over the herd , and selecting for breeding just those animals which had the qualities desired , allowing no others to breed . The tendency of plants to sport has already been mentioned , and such a ...
Page 67
tion of the various forces opposed to life , in weeding out all those individuals which are least qualified to live , Mr. Darwin has given the well - known name of natural selection.1 Herbert Spencer , the distinguished English ...
tion of the various forces opposed to life , in weeding out all those individuals which are least qualified to live , Mr. Darwin has given the well - known name of natural selection.1 Herbert Spencer , the distinguished English ...
Page 69
It is not pretended that natural selection is . capable of giving rise to variations , but only that it acts in an extraordinarily powerful and certain way ( from the immense scale on which it operates ) , in giving additional chances ...
It is not pretended that natural selection is . capable of giving rise to variations , but only that it acts in an extraordinarily powerful and certain way ( from the immense scale on which it operates ) , in giving additional chances ...
Page 70
And so , with much the same result as that which the farmer obtains by selecting his seedcorn , the gardener by thinning out ... and it is as allowable to speak of natural selection as to use the expression , “ the howling of the wind .
And so , with much the same result as that which the farmer obtains by selecting his seedcorn , the gardener by thinning out ... and it is as allowable to speak of natural selection as to use the expression , “ the howling of the wind .
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A Primer of Darwinism and Organic Evolution Joseph Young Bergen,Fanny Dickerson Bergen No preview available - 2015 |
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already America animals and plants apes appear bearing become beginning birds body called cause changes chapter closely color common comparatively condition continent Darwin descent described domestic earth Europe evidence evolution example existence fact feet fishes flower forms fossil geological give given groups growth hand head higher horse human hundred illustration individual insects instance islands kind known latter less living mammals means natural naturalists nearly noticed observations occur once organs origin Origin of Species period possession present probably produced Professor question quoted races regard region remains resemblance result says seeds seems selection separated shells short shown similar special creation species striking structure surface taken theory thing tion trees true usually variations varieties vegetable whole widely wild young
Popular passages
Page 226 - ... would it be too bold to imagine, that all warmblooded animals have arisen from one living filament, which THE GREAT FIRST CAUSE endued with animality, with the power of acquiring new parts, attended with new propensities, directed by irritations, sensations, volitions, and associations; and thus possessing the faculty of continuing to improve by its own inherent activity, and of delivering...
Page 229 - America, and in the geological relations of the present to the past inhabitants of the continent. These facts 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. On my return home it occurred to me (in 1837) that something might perhaps be made out on this question by patiently accumulating and reflecting on all sorts of facts which could possibly have any bearing on it. After five years I allowed myself to...
Page 58 - Even slow-breeding man has doubled in twenty-five years, and at this rate, in a few thousand years, there would literally not be standing room for his progeny. Linnaeus has calculated that if an annual plant produced only two seeds — and there is no plant so unproductive as this — and their seedlings next year produced two, and so on, then in twenty years there would be a million plants.
Page 58 - ... and during some season or occasional year, otherwise, on the principle of geometrical increase, its numbers would quickly become so inordinately great that no country could support the product.
Page 6 - The tawny lion, pawing to get free His hinder parts, then springs as broke from bonds, And rampant shakes his brinded mane...
Page 28 - On the evidence of palaeontology, the evolution of many existing forms of animal life from their predecessors is no longer an hypothesis, but an historical fact ; it is only the nature of the physiological factors to which that evolution is due which is still open to discussion.
Page 229 - On my return home, it occurred to me — in 1837 — that something might perhaps be made out on this question by patiently accumulating and reflecting on all sorts of facts which could possibly have any bearing on it. After five years' work I allowed myself to speculate on the subject, and drew up some short notes. These I enlarged in 1844 into a sketch of the conclusions which then seemed to me probable. From that period to the present day I have steadily pursued the same object. I hope that I...
Page 183 - ... 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...
Page 190 - Further towards the north are to be found men living absolutely in a state of nature, who neither cultivate the ground, nor live in huts ; who neither eat rice nor salt, and who do not associate with each other, but rove about some woods, like wild beasts.
Page 232 - The final cause, of this contest amongst the males seems to be, that the strongest and most active animal should propagate the species, which should thence become improved.
Bibliographic information
| Title | A Primer of Darwinism and Organic Evolution |
| Authors | Joseph Young Bergen, Fanny Dickerson Bergen |
| Edition | reprint |
| Publisher | Lee and Shepard, 1890 |
| Original from | Harvard University |
| Digitized | 15 Apr 2008 |
| Length | 261 pages |
| Export Citation | BiBTeX EndNote RefMan |