Recent Publications. 419* 
IV. 
Excerpts and Individual Publications. 
Notes on a trip to the Lapari Islands, Wm. H. Hobbs, Trans, of the 
Wis. Acad., Vol. IX. 
Organic Matter as a Geological Agent, A. Irving, Proc. Geol. Assoc, 
Vol. XII. 
On the Geology of part of the Province of Quebec, south of the St. 
Lawrence River, E. W. Ells, Trans. Roy. Soc. Canada, Sec. IV, 1891. 
The Pleistocene History of Northeastern Iowa, W J McGee, 11th an- 
nual report, U. S. Geol. Survey, 1889-90. 
The Eruptive Rocks of Electric Peak and Sepulchre Mountain, Yel- 
lowstone National Park, Joseph Paxson Iddings, 12th annual report, 
U. S. Geol. Survey, 1890-91. 
The North American Continent during Cambrian Time, Charles D. 
Walcott, 12th annual report, U. S. Geol. Survey, 1890-91. 
Note on the occurrence of Grahamite in Texas, E. T. Dumble, Trans. 
Amer. Instit. Mining Engineers, Oct., 1892. 
On the Contrast and Color of the Soils of High and Low Latitudes, 
W. O. Crosby, Proc. Bos. Soc. Nat. Hist., Vol. XXIII, pp. 219-222. 
Geology of Hingham, Mass., W. O. Crosby, Proc. Bos. Soc. Nat. Hist., 
Vol. XXV, May 18, 1892. 
Source of the Texas Drift, E. T. Dumble, Proc. Tex. Acad. Sci. 
Volcanic Dust in Texas, E. T. Dumble, read June 14, 1892, Trans. 
Tex. Acad. Sci. 
Notes on the Geology of Skunnemunk Mountain, Orange county, N. 
Y., Chas. S. Prosser, Topeka, Kansas, Trans. N. Y. Acad. Sci., Vol. XI, 
Nos. 6, 7, 8, June, 1892. 
Notes on the Geology of the Valley of the Middle Rio Grande, E. T. 
Dumble, Bui. Geol. Soc. Amer., Vol. Ill, pp. 219-230. 
1. Petrographical Notes, N. Y, Acad. Sci., Vol. XI, Nos. 6, 7, 8. 
2. The Great Shear Zone at Avalanche Lake in the Adirondacks, J. F. 
Kemp, Amer. Jour. Sci., Aug., 1892. 
The Manufacture of Coke, Jas. D. Weeks, Extr. Min. Resources of 
U. S , 1891. 
Twenty Years of Progress in the Manufacture of Iron and Steel in 
the U. S., James M. Swank, Extr. Min. Resources of U. S., 189i. 
Finite Homogeneous Strain, flow and rupture of rocks, by Geo. F. 
Becker, Bui. Geol. Soc. Amer., Vol. IV, pp. 13-90, 1893. 
Determination of the dates of the publication of Conrad's " Fossils of 
the Tertiary Formation" and "Medial Tertiary," by Wm. H. Dall, 
Philosophical Soc. of Washington, Bui., Vol. XII, pp. 215-240, 1893. 
Natural Gas Fields of Indiana, by Arthur John Phinney, 11th annual 
report of director of U. S. Geol. Survey, 1889-90. 
Note on the Quartz-bearing Gabbro in Maryland, by U. S. Grant, 
Johns Hopkins University Circulars, No. 103, February, 1893. 
Shippen and Wetherill Tract, by Benj. Smith Lyman. 
The Production of Columbous and Tungstous Oxides in forming Com- 
pounds of Iron and Tin, by Wm. P. Headden, Proc. Colo. Sci. Soc, 1893. 
