. Elements of geology : a text-book for colleges and for the general reader. Geology. VISCOSITY THEORY OF FORBES. 61 and sides of their channels. They have their shallows and their deeps, their narrows and their lakes, their cascades, their rapids, and their tranquil portions. Fig. 52 shows a glacier running through a narrow gorge into a wide lake of ice, and again through another gorge. There is this difference, however, between a glacier and a water-current, viz., that, while the latter conforms to even the minutest and sharpest outlines, the former con- forms only to the larger or more gent
. Elements of geology : a text-book for colleges and for the general reader. Geology. VISCOSITY THEORY OF FORBES. 61 and sides of their channels. They have their shallows and their deeps, their narrows and their lakes, their cascades, their rapids, and their tranquil portions. Fig. 52 shows a glacier running through a narrow gorge into a wide lake of ice, and again through another gorge. There is this difference, however, between a glacier and a water-current, viz., that, while the latter conforms to even the minutest and sharpest outlines, the former con- forms only to the larger or more gentle. In this, a glacier acts like a stiff, viscous fluid. 7. The Line of Swiftest Motion is more sinuous than the Channel.—We have already seen that this is true of rivers (page 24). The line of swiftest current is reflected from side to side, increasing the curves by erosion. The same has been recently proved by Tyn- dall to be the case with glaciers. Fig. 53 represents a portion of a sinuous glacier, like the Mer de Glace: the dotted line represents the line of swiftest Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original LeConte, Joseph, 1823-1901. New York : D. Appleton and Co.
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