I08 THE JOURNAL OF GEOLOGY. 



— The Eozoic and Lower Paleozoic in South Wales and. their Comparison 

 with their Appalachian Analogues. . 1 8 pp. — Am. Inst. Min. Engin., Feb., 1883. 



— Geological and Mineral Studies in Nuevo Leon and Coahuilla, Mexico. 36 

 pp., Ill, 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 Geolo- 

 gists. 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 Wil- 

 liamson's Point, Penn. 8 pp., i 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., 111.— -Trans Am. Inst. Min. Engin., June, 1883. Read at the Roanoke, Va., 

 Meeting. 



• — A Broader P'ield 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 pi. — 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^ Geology of Chester County, 

 Penn. 6 pp. — Journ. P'ranklin Inst., Oct., 1883. 



— Archaean Characters of the Rocks of the Nucleal Ranges of theAntilles. I 

 p.— Brit. Assn., 1888. 



— Notes on Fresh - Water Wells of the Atlantic Beach. 4 pp. — Journ. Frank- 

 lin 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 pi. — Am. Phil. Soc'y, April 16, 1875. 



— The Whopper Lode, Gunnison County, Colo. 10 pp. — Am. Inst. Min. 

 Engin., Aug., r88o. 



— Some Copper Deposits of Carroll County, Md. 8 pp., i pi. — Am. Inst. 

 Min. Engin., Aug., 1880. 



— A Convenient Device to be Applied to the Hand Compass, i 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- 



— Note on the New Geological Map of Europe. 6 pp. — Trans. Am. Inst. Min. 

 Engin. 



— Some Supposed Fossils from the Susquehanna River, just South of the Penn- 

 sylvania-Maryland Line. 3 pp., I pi. — Proc. Am. Phil. Soc'y XVIII, Sept. 18, 



1879. 



— Missing Ores of Iron. 12 pp., 111. — Trans. Am. Inst. Min. Engin., Vol. VI, 



1879. 



— The Peach' Botttom Slates of Southeastern York and Southern Lancaster 

 Counties, Penn. 5 pp., i. pi. — Trans. Am. Inst. Mining Engin., 1883. 



— A Speculation on Protoplasm. 7 pp. — Am Nat., July, 1876. 



