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Nature volume 49, pages 155156 | Download Citation



DR. A. R. WALLACE contributes to the Fortnightly the second part of his article on “The Ice Age and its Work.” He deals in detail with the erosion of lake basins, first describing the different kinds of lakes, and their distribution, and then the conditions that favour the production of lakes by ice-erosion. The objections of modern writers are afterwards considered seriatim, and the manner in which they are handled will give pleasure to all glacialists. The alternative theory to that of ice-erosion, for the origin of the class of lakes discussed, viz. that they were formed before the glacial epoch, by earth movements of the same nature as those concerned in mountain formation, appears to be fairly presented, and the difficulties in the way of accepting it are pointed out. Evidence is adduced to show that the contours and outlines of the lakes in question indicate erosion rather than submergence, and, finally, the Lake of Geneva is taken as a test of the two rival theories. As the subject discussed is very complex, and the argument essentially a cumulative one, Dr. Wallace gives the following summary of the main points:—

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