116 GEOLOGY. 



Deinker, H. S. Abstract of a paper on the Mines and Works of the 

 Lehigh Zinc Company. Trans. Amer. Inst. Min. Eng. vol. i. 

 p. 67. 



Account of the position, rocks, and minerals of the mines, pp. 67, 68. 



Desor, E. Le Pare National des Etats-Unis. Bull. Soc. Sci. Nat. 



Neuchatel, t. x. l'' cahier, pp. 100-109. 

 A general account of the Yellowstone tract. 



DoERiNG, Dr. D. A. Estudios sobre la proportion quimica y fisica 



del terrene en la formacion de la Pampa. [Chemical and physical 



investigation of the Pampas formation.] Bol. Acad. Nac. Cordova, 



pt. iii. [With analyses of soils.] 



Douglas, James. The Native Copper Mines of Lake Superior. Quart. 



Journ. Sci. no. xlii. pp. 162-180, with chromo-lithographic plate; 



and Canad. Nat. (N.S.) vol. vii. no. 6, pp. 318-336. 



A sketch of the geology of the copper-mining region of Lake Superior, 



with special descriptions of the Quincey Mines, opened on the Pewabic 



lode, in amygdaloidal trap, and of the Calumet and Hecla mine, worked on 



a bed of copper-bearing conglomerate. Describes the methods of mining 



and dressing the ores, and gives statistics of production. E. W. R. 



EoNTAi]s-E, Wm. M. The " Great Conglomerate " on New River, West 

 Virginia. Amer. Journ. ser. 3, vol. vii. pp. 459-465, 573-579. 



A discussion of the age of a great formation of sandstones, contain- 

 ing important beds of coal, which in the hills along New River crop 

 out for nearly forty miles from beneath the lowest beds of the Lower 

 Coal series. The author, with Prof. W. B. Rogers, believes this forma- 

 tion to be the equivalent of the " Great Conglomerate." He concludes 

 by suggesting that the successive formation of coal on a large scale 

 along the S.W. border of the Appalachian coal-field, commencing in the 

 Devonian period, may point to the existence at this time of a conti- 

 nental mass nearer than the Azoic of Canada. Details regarding the 

 Kanawha coal-held are given. G. A. L. 



Eraser, Prof. P., Jun. On the Geology of Certain Lands in Ritchie 

 and Tyler Counties, W. Va. Proc. Ac. Nat. Sci. Philadel. p. 168. 



. [Remarks on the Pilot-Knob, Iron-Mountain, and Mine-La- 



Motte districts, Missouri.] Proc. Ac. Nat. Sci. Philadel. part ii. 

 pp. 85, 86. 

 Fulton, John. Note on the Somerset-County Coal beds in Pennsyl- 

 vania. Proc. Amer. Phil. Soc. vol. xiv. no. 92, pp. 157, 158. 

 Gabb, AV. M. Notes on the Geology of Costa Rica. Amer. Journ. 



ser. 3, vol. viii. pp. 838-390. 

 A letter. Chiefly an account of an ascent and examination of Pico 

 Blanco, which the writer says is not a volcano, although its summit 

 exposes a dyke bared by denudation. The mountain, 10,200 feet high 

 (1500 feet lower than formerly supposed), is *' the culminating point 

 of a granite intrusion from below Miocene rocks." G. A. L. 



