Rogers, W. B., On the gravel and cobble-stone deposits of Virginia and the Middle States, Proc. Boston Soc. Nat. Hist., 18, 1875; this Journal, =11=, 60–61, 1876. Footnote 61: Kerr, W. C, Origin of some new points in the topography of North Carolina, this Journal, =21=, 216–219, 1881. Footnote 62: Gilbert, G. K., On certain glacial and post-glacial phenomena of the Maumee valley, this Journal, =1=, 339–345, 1871. Footnote 63: Chamberlin, T. C., On the geology of eastern Wisconsin, Geol. of Wisconsin, =2=, 1877; this Journal, 15, 61, 406, 1878. Footnote 64: Chamberlin, T. C, Preliminary paper on the terminal moraine of the second glacial epoch, U. S. Geol. Survey, Third Ann. Rept., 291–402, 1883. Footnote 65: Wright, G. F., Unity of the glacial epoch, this Journal, =44=, 351–373, 1892. Upham, Warren, The diversity of the glacial drift along its boundary, ibid., =47=, 358–365, 1894. Wright, G. F., Theory of an interglacial submergence in England, ibid., =43=, 1–8, 1892. Chamberlin, T. C., Diversity of the glacial period, ibid., =45=, 171–200, 1983 Dana, J. D., On New England and the upper Mississippi basin in the glacial period, ibid., =46=, 327–330, 1893. Wright, G. F., Continuity of the glacial period, ibid., =47=, 161–187, 1894. Chamberlin, T. C. and Leverett, F., Further studies of the drainage features of the upper Ohio basin, ibid., =47=, 247–282, 1894. Footnote 66: Pumpelly, Raphael, Geological researches in China, Japan, and Mongolia, Smithsonian Contributions, No. 202, 1866. Footnote 67: Kingsmill, T. W., The probable origin of “loess” in North China and eastern Asia, Quart. Jour. Geol. Soc., =27=, No. 108, 1871. Footnote 68: Pumpelly, Raphael, The relation of secular rock-disintegration to loess, glacial drift and rock basins, this Journal, =17=, 135, 1879. Footnote 69: Binney, A., Some geologic features at Natchez on the Mississippi River, Proc. Boston Soc. Nat. Hist., =2=, 126–130, 1848. Footnote 70: Hilgard, E. W., The loess of Mississippi Valley, and the eolian hypothesis, this Journal, =18=, 106–112, 1879. Footnote 71: Chamberlin, T. C, Supplementary hypothesis respecting the origin of the loess of the Mississippi Valley, Jour. Geol., =5=, 795–802, 1897. Footnote 72: Ramsay, A. C., On the glacial origin of certain lakes in Switzerland, the Black Forest, Great Britain, Sweden, North America, and elsewhere, Quart. Jour. Geol. Soc., 1862; this Journal, =35=, 324–345, 1863. Preliminary statements of this theory appeared in 1859 and 1860. Footnote 73: Whittlesey, Charles, Smithsonian Contributions, No. 197, 1864. Footnote 74: LeConte, Joseph, On some of the ancient glaciers of the Sierras, this Journal, =5=, 325–342, 1873, 10, 126–139, 1875. Footnote 75: King, Clarence, U. S. Geol. Expl. 40th Par., 1, 459–529, 1878. Footnote 76: