The recent valuable paper by C. E. Van Orstrand on “Normal Geothermal Gradient in United States,” in this Bulletin, Vol. 19, No. 1 (January, 1935), pp. 78-115, suggests certain further lines of work. The isocon map for Ordovician waters prepared by Dott in 1930, this Bulletin, Vol. 14, No. 9 (September, 1930), p. 1215, suggests the problem of the cause and method of increase of concentration at depth; and besides the suggestions made by Case, it had occurred to me that it might be due to an imbibition or absorption of water in chemical reactions such as are...

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