Studies Scientific & Social, 1. köideMacmillan and Company, 1900 - 532 pages |
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Page 12
... alluvium . Even Darwin was staggered at the idea of these enclosed valleys being hollowed out by aqueous erosion . Neither does he accept subsidence , on account of the numerous irregularly branching arms . The resemblance of the cliffs ...
... alluvium . Even Darwin was staggered at the idea of these enclosed valleys being hollowed out by aqueous erosion . Neither does he accept subsidence , on account of the numerous irregularly branching arms . The resemblance of the cliffs ...
Page 65
... alluvium , and may origin- ally have been one of those abrupt craggy rocks a few hundred feet high , which , owing to their superior hardness or tenacity , resisted ordinary denudation , and which , when above the old ice - level , form ...
... alluvium , and may origin- ally have been one of those abrupt craggy rocks a few hundred feet high , which , owing to their superior hardness or tenacity , resisted ordinary denudation , and which , when above the old ice - level , form ...
Page 106
... alluvium previous to the glacial epoch , and that the ice cleared out this incoherent matter ; but it is almost certain that no such clearance would have taken place , because the glacier would pass over such a surface , the stones ...
... alluvium previous to the glacial epoch , and that the ice cleared out this incoherent matter ; but it is almost certain that no such clearance would have taken place , because the glacier would pass over such a surface , the stones ...
Page 119
... alluvium . And the same is the case with the lakes of Geneva , Brienz , and most others . When lateral alluvial valleys at all commensurable in size with the depth of the lake are proved to exist , this objection may be made . At ...
... alluvium . And the same is the case with the lakes of Geneva , Brienz , and most others . When lateral alluvial valleys at all commensurable in size with the depth of the lake are proved to exist , this objection may be made . At ...
Page 124
... alluvium which is always found underneath the boulder- clay and other glacial deposits . This alluvium is , more- over , admitted to be formed in every case of materials largely derived from the great Alpine range . Now here is a fact ...
... alluvium which is always found underneath the boulder- clay and other glacial deposits . This alluvium is , more- over , admitted to be formed in every case of materials largely derived from the great Alpine range . Now here is a fact ...
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Common terms and phrases
abundant adapted Africa allied alluvium Alpine America animals appear apterous argument Asia Australians Azores beautiful BIRD OF PARADISE birds causes characteristic characters coast colour considerable continuous crust curious Darwin denudation distinct Eastern equally erosion erratics Europe European evidence existence extensive fact favourable feet flora flowers forests genera genus geological geologists glacial glacier gorge groups Guinea hair ice age ice-sheet important individual inhabit insects islands Lake Zurich lakes land larvæ lemurs less Madeira Mahoris Malay miles Miocene modification monkeys moraine mountain native natural selection naturalists Nearctic nearly North occur ocean organic origin origin of species Palearctic Papuans peculiar phenomena plants Polynesians portion probably produced Professor race regions remarkable Rhone glacier river rock rocky slopes species streams supposed surface tail theory thickness tion trees tribes tropical valley valley-lakes variation varied whole winged writers Yosemite YOSEMITE VALLEY
Popular passages
Page 289 - 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 371 - Nothing is easier than to admit in words the truth of the universal struggle for life, or more difficult— at least I have found it so— than constantly to bear this conclusion in mind. Yet unless it be thoroughly engrained in the mind, the whole economy of nature, with every fact on distribution, rarity, abundance, extinction, and variation, will be dimly seen or quite misunderstood.
Page 10 - We conceive that, during the process of upheaval of the Sierra, or, possibly, at some time after that had taken place, there was at the Yosemite a subsidence of a limited area, marked by lines of ' fault' or fissures crossing each other somewhat nearly at right angles. In other and more simple language, the bottom of the Valley sank down to an unknown depth, owing to its support being withdrawn from underneath during some of those convulsive movements which must have attended the upheaval of so extensive...
Page 342 - In my opinion, the greatest error which I have committed has been not allowing sufficient weight to the direct action of the environments, ie, food, climate, &c., independently of natural selection . . . When I wrote the 'Origin,' and for some years afterwards, I could find little good evidence of the direct action of the environment; now there is a large body of evidence, and your case of the Saturnia is one of the most remarkable of which I have heard.
Page 12 - ... vertical displacement for the small area implicated which makes this a peculiar case; but it would not be easy to give any good reason why such an exceptional result should not be brought about, amid the complicated play of forces which the elevation of a great mountain chain must set in motion. By the adoption of the subsidence theory for the formation of the Yosemite, we are able to get over one difficulty which appears insurmountable with any other. This is, the very small amount of debris...
Page 14 - To descend into some of these valleys, it is necessary to go round twenty miles; and into others, the surveyors have only lately penetrated, and the colonists have not yet been able to drive in their cattle. But the most remarkable feature in their structure is, that although several miles wide at their heads, they generally contract towards their mouths to such a degree as to become impassable.
Page 350 - At last gleams of light have come, and I am almost convinced (quite contrary to the opinion I started with) that species are not (it is like confessing a murder) immutable.
Page 9 - The principal features of the Yosemite, and those by which it is distinguished from all other known valleys, are : first, the near approach to verticality of its walls ; second, their great height, not only absolutely, but as compared with the width of the Valley itself; and, finally, the very small amount of talus or debris at the base of these gigantic cliffs.
Page 349 - What cannot nature effect with such means at her disposal? She can do all except either create matter or destroy it. These two extremes of power the Deity has reserved for Himself only; creation and destruction are the attributes of His omnipotence. To alter and undo, to develop and renew — these are powers which He has handed over to the charge of nature.
Page 297 - By JA Allen. (Bulletin of the Mntevm of Comparafire Zoology at Harvard College, Cambridge, Mass., vol. ii. No. 3.) in proportions ; in the length of the head, feet, wings, and tail ; in the length of particular feathers, thus altering the shape of the wing or tail ; in the length of the tarsi and of the separate toes ; and in the length, width, thickness, and curvature of the bill. These variations are by no means small in amount or requiring very accurate measurements for their detection, since...