The _Eighteenth Annual Report of the United States Geological Survey_[33] mentions, as an important change in the field work that made necessary by the legislation providing for the establishment of levels and permanent monuments and bench marks, of which 10,840 miles of levels were run and 1,820 bench marks were established. The topographic surveys to date covered an aggregate area of 759,525 square miles, of which 240,000 square miles were on a scale of four miles to the inch. The topographic work has progressed very satisfactorily under the present organization of the survey, including, in the year covered by the report, surveys in the Indian Territory and of the northern part of the boundary line between Idaho and Montana--the first work of the kind assigned to the Geological Survey--and the beginning of the survey of the forest reserves. The work on the educational series of rocks has been completed. It includes two hundred and fifty larger and smaller sets, which will be distributed to institutions where geology is taught. In his general report the director mentions the work of more than thirty geological parties in all parts of the United States, of six paleontological parties, hydrographic and topographic surveys by States, and the work of the division of mineral resources, the full account of which will constitute Part V of the report. The theoretic and other papers in Part II relate to the Triassic Formation of Connecticut (W. M. Davis), Geology of the Edwards Plateau, etc., Texas (R. T. Hill and J. W. Vaughan), North American Tertiary Horizons (W. H. Dall), Glaciers of Mount Rainier (I. C. Russell) and Rocks of Mount Rainier (G. O. Smith), The Franklin White Limestone of New Jersey (J. E. Wolfe and A. H. Brooks), the Geology of San Clemente Island (W. S. T. Smith), Geology of the Cape Cod District (N. H. Shaler), and Recent Earth Movement in the Great Lakes Region (G. K. Gilbert). Part III contains papers on the gold districts of Alaska, by G. F. Becker, J. E. Spurr, and H. B. Goodrich; Coal Fields of Puget Sound (B. Willis), the Judith Mountains of Montana (W. H. Weed and L. V. Pirsson), Certain Mining Districts in Idaho (W. Lindgren and F. H. Knowlton), and the Mining Districts of the Telluride Quadrangle, Colorado (C. W. Purington). The four papers in Part IV are a Report of Progress of Stream Measurements during 1896, by A. P. Davis; the Water Resources of Indiana and Ohio, by Frank Leverett; New Developments in Well-boring in South Dakota, by N. H. Darton; and Water Storage and the Construction of Dams, by J. D. Schuyler.