[69]. Binney, A., Some geologic features at Natchez on the Mississippi River, Proc. Boston Soc. Nat. Hist., 2, 126–130, 1848.

[70]. Hilgard, E. W., The loess of Mississippi Valley, and the eolian hypothesis, this Journal, 18, 106–112, 1879.

[71]. Chamberlin, T. C, Supplementary hypothesis respecting the origin of the loess of the Mississippi Valley, Jour. Geol., 5, 795–802, 1897.

[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.

[73]. Whittlesey, Charles, Smithsonian Contributions, No. 197, 1864.

[74]. LeConte, Joseph, On some of the ancient glaciers of the Sierras, this Journal, 5, 325–342, 1873, 10, 126–139, 1875.

[75]. King, Clarence, U. S. Geol. Expl. 40th Par., 1, 459–529, 1878.

[76]. Davis, W. M., Glacial erosion, Proc. Boston Soc. Nat. Hist., 22, 58, 1882.

[77]. Sabine, Sir Edward, Address of the president of the Royal Society, this Journal, 37, 108, 1864.

IV
A CENTURY OF GEOLOGY.—THE GROWTH OF KNOWLEDGE OF EARTH STRUCTURE