Proceedings of the American Association for the Advancement of Science. August 1856

Proceedings of the American Association for the Advancement of Science. August 1856

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1857 edition. Excerpt: comparison with his own stature. But a section of the land, true to nature, corrects this misapprehension. In a section of the North American continent, drawn to a scale twelve feet long, one ninth of an inch will stand for an altitude of 10,000 feet; one sixteenth of an inch for the White Mountains, and about three tenths for the Himalayas. After this review of principles, let us now turn our attention to North America and seek out its plan of development. I. The triangular form of the continent has been noted and its simple ocean boundary: and it should be observed that the continent is set quite to the west of South America, so as to possess this simplicity of boundary and therefore of moulding forces in its highest perfection. The small Atlantic on one side, and the great Pacific on the other, indicate approximately the relative amounts of force from the two directions, the south-east and south-west, during the progressive ages of the history;--that to the eastward the power was comparatively moderate, gently folding up the Appalachians, and to the westward it was strong and mighty, even to the raising of the Rocky range and opening the great volcanoes of Oregon. We thus learn, with a degree of precision not to have been anticipated, the direction and efficiency of the great organizing forces. Glance now at American geological history from this point of view, and consider where was the first germinant spot of the growing continent, and what was thence onward the course of development under the influence of this agency. The earliest spot or primal area will be that of the Azoic rocks, the first in the geological series. Such an area (see Chart, AAA) extends from Northern New York and Canada, north-west to the Arctic Ocean, lying between more

Product details

  • Paperback | 174 pages
  • 189 x 246 x 9mm | 322g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236530942
  • 9781236530943