Recent Publications. 



-Arnold, Ralph. The Paleontology and Stratigraphy of the Marine 

 Pliocene and Pleistocene of San Pedro, California. Memoirs of the 

 Cal. Acad. Sci., Vol. Ill ; San Francisco, June, 1903.] 



-Barre, O. L'architecture du sol de la France; Essai de gdographie tec- 

 tonique, [Paris: Librairie Armand Colin, 1903.] 



-Beecher, C. E. Paleozoic Phyllocarida from Pennsylvania. [Quart. Jour. 

 Geol. Soc, Vol. LVIII, 1902, pp. 441-49, and Plates XVII-XIX.] 



Observations on the Genus Romingeria, with Plates I-V. [From 



Amer. Jour. Sci., Vol. XVI, July, 1903.] 



Note on a New Xiphosuran from the Upper Devonian of Pennsyl- 

 vania. [From Amer. Geol., Vol. XXIX, March, 1902.] 



-Buckley, E. R. Highway Construction in Wisconsin. [Wis. Geol. and 

 Nat. Hist. Survey., Bull. No. 10; Madison, 1903.] 



-Clarke, Frank W., and Steiger, George. The Action of Ammonium 

 Chloride upon Silicates. [U. S. Geol. Surv., Bull. No. 207 ; Wash- 

 ington, igo2.] 



-Clarke, John M., and Rudemann, Rudolph. Guelph Fauna in the 

 State of New York. [Memoir No. 5, N. Y. State Mus.; Albany, 1903.] 



-Cleland, Herdman F. A Study of the Fauna of the Hamilton Forma- 

 tion of the Cayuga Lake Section in Central New York. [U. S. Geol. 

 Surv., Bull. No. 206; Washington, 1903.] 



-Condra, G. E. An Old Platte Channel. [From Amer. Geol., June, 1903.] 



-CoRSTORPHiNE, G. S. Note on the Age of the Central South African 

 Coalfield. [From Trans. So. Afr. Geol. Soc, Vol. VI, Part II, pp. 

 16-19, June, 1903; Johannesburg.] 



-Daly, Reginald A. The Mechanics of Igneous Intrusion (second paper). 

 [From Am. Jour. Sci., Vol. XVI, August, 1903.] 



-Geological Survey of Scotland, Memoir of the. The Geology of North 

 Arran, South Butte, and the Cumbraes, with Parts of Ayrshire and 

 Kyntire. [Edinburgh: John Menzies & Co., 1903.] 



-Grant, U. S. Preliminary Report on the Lead and Zinc Deposits of 

 Southwestern Wisconsin. [Wis. Geol. and Nat. Hist. Surv., Bull. No. 

 9 ; Madison, 1903.] 



-Greenly, E. The Diffusion of Granite into Crystalline Schists. [Extracted 

 from the Geol. Mag., N. S., Decade IV, Vol. X, pp. 207-12; London, 

 May, 1903.] 



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