830 RECENT PUBLICATIONS 
Eastern China—Studies in Europe—Geological Research in Continental 
Histories—Artesian Water Conditions at Pekin, China. [Extracted from 
the Fourth Year Book of the Carnegie Institution of Washington, pp. 192- 
220. Washington, 1906.] 
—Witson, A. W. G. On the Glaciation of Orford and Sutton Mountains, 
Quebec. [From The American Journal of Science, Vol. XXI, March, 1906.] 
Physiography of the Archean Areas of Canada. 
Wootsey, L. H. Economic Geology of the Beaver Quadrangle, Pennsylvania. 
[U. S. Geological Survey. Bulletin No. 286. Series A, Economic Geology, 
74. Series B, Descriptive Geology, 93. Washington, 1906.] 
—Wricnut, F. E. A Modification of the Lasaulx Method for Observing Inter- 
ference Figures under the Microscope. [From The American Journal of 
Science, Vol. XXII, July, 1906.] 
Schistosity by Crystallization. A Qualitative Proof. [From The Ameri- 
can Journal of Science, Vol. XXII, September, 1906.] 
The Determination of the Feldspars by Means of their Refractive 
Indices. [From The American Journal of Science, Vol. XXI, May, 1906. | 
