--General Notes on the New Orleans Industrial and Cotton Exhibition. 20 pp.--Journal Franklin Institution, June, 1885. --The Eozoic and Lower Paleozoic in South Wales and their Comparison with their Appalachian Analogues. 18 pp.--Am. Inst. Min. Engin., Feb., 1883. --Geological and Mineral Studies in Nuevo Leon and Coahuilla, Mexico. 36 pp., =III=, and maps.--Am. Inst. Min. Engin., Feb., 1884. --Trap Dykes in the Archaean Rocks of Southeastern Pennsylvania. 4 pp.--Am. Phil. Soc., Oct. 17, 1884. --Classification of Coals. 22 pp.--Trans. Am. Inst. Min. Engin., Vol. VI, 1879. --Descriptive Table of Elements. 2 pp.--1891. --The late International Geological Congress at Berlin. 4 pp.--Am. Phil. Soc'y, Nov. 20, 1885. --Report of the American Committee of the International Congress of Geologists. 5 pp.--Proc. A. A. A. S., Vol. XXXV, August, 1886. --General Notes on the Geology of York County, Penn. 20 pp.--Colored maps. --On the Physical and Chemical Characteristics of a Trap occurring at Williamson's Point, Penn. 8 pp., 1 colored plate. Read before Am. Phil. Soc'y, Dec. 20, 1878. --An Hypothesis of the Structure of the Copper Belt of the South Mountain. 4 pp., Ill.--Trans. Am. Inst. Min. Engin., June, 1883. Read at the Roanoke, Va., Meeting. --A Broader Field for the U. S. Geological Survey. 4 pp.--Journ. Franklin Instit., Sept., 1888. --The Peach Bottom Slates of the Lower Susquehanna, with sections of the Right and Left Banks. 5 pp., 3 pl.--Am. Inst. Min. Eng., Oct., 1883. --Reply to a paper entitled "Notes on the Geology of Chester Valley and Vicinity." 8 pp.--Journ. Franklin Inst., April, 1884. --Mr. Theodore D. Rand's Criticism of Vol. C_{4} Geology of Chester County, Penn. 6 pp.--Journ. Franklin Inst., Oct., 1883. --Archaean Characters of the Rocks of the Nucleal Ranges of the Antilles. 1 p.--Brit. Assn., 1888. --Notes on Fresh-Water Wells of the Atlantic Beach. 4 pp.--Journ. Franklin Inst., Sept., 1890. --The Position of the American New Red Sandstone. 8 pp.--Trans. Am. Inst. Min. Engin., Vol. V. --On the Traps of the Mesozoic Sandstone in York and Adams Counties, Penn. 13 pp., 4 pl.--Am. Phil. Soc'y, April 16, 1875. --The Whopper Lode, Gunnison County, Colo. 10 pp.--Am. Inst. Min. Engin., Aug., 1880. --Some Copper Deposits of Carroll County, Md. 8 pp., 1 pl.--Am. Inst. Min. Engin., Aug., 1880. --A Convenient Device to be Applied to the Hand Compass. 1 p.--Am. Phil. Soc'y, Dec. 5, 1884. --The Approaches to a Theory of the Causes of Magnetic Declination. 16 pp.--Am. Phil. Soc'y, Apr. 6, 1877. --On Improvement in the Construction of the Hypsometric Aneroid.--Am. Phil. Soc'y, March 2, 1883. --An Exfoliation of Rocks near Gettysburg. 2 pp.--Am. Phil. Soc'y, Dec. 4, 1874.