324 The American Geologist. November, 1905 
in the region about Afton junction and Thayer. (Proc. Dav. Acad. 
Sci., vol. 10, pp. 18-30.) 
CAMPBELL, M. R. 
Hypothesis to account for the transformation of vegetable mat- 
ter into the different varieties of coal. (Bcon. Geol., vol. 1, pp. 
26-33, Oct.-Nov., 1905.) 
CLELAND, H. F. 
Formation of natural bridges. (Am. Jour. Sci., vol. 20, pp. 119- 
125, Aug., 1905.) 
CRAGIN, F. W. 
Paleontology of the Malone Jurastsic formation of Texas. U. 
S. Geol. Sur., Bull. 266, pp. 172, 29 plates, 1905. 
CRANE, W. R. 
The Quapaw Zinc district. (Eng. Min. Jour., vol. 80, p. 488, 
Sept. 16, 1905.) 
CRANE, W. R. 
Asphalt in Indian Territory. (Eng. Min. Jour., vol. 80, p. 442, 
Sept. 9, 1905.) 
CRANE, W. R. 
Coal mining in Arkansas. (Eng. Min. Jour., vol. 80, p. 774, 
Oct. 28, 1905.) 
t 
CROSBY, W. O. 
Water supply from the delta type of sand plain. (Wat. Sup. 
Ir. Pap., 145, pp. 161-178, 1905.) 
CUM1NGS, E. R. 
Development of Fenestella. (Am. Jour. Sci., vol. 20, pp. 169-178, 
Sept., 1905.) 
DALY, R. A. 
The secondary origin of certain granites. (Am. Jour. Sci., vol. 
20, pp. 185-217, Sept., 1905.) 
DARTON, N. H. 
Age of the Monument Creek formation. (Am. Jour. Sci., vol. 
20, Sept. 1905, pp. 178-181.) 
• DARTON, N. H. 
Preliminary List of Deep Borings in the United States. U. S. 
G. S. Wat.-Sup. and Irr. Pap. No. 149, pp. 175, 1905. 
DAVIS, W. M. 
The Geographical Cycle in an arid climate. (Jour. Geol., vol. 
13, pp. 381-408, July-Aug., 1905.) 
DAY, D. T. (and Contributors). 
Mineral Resources of the United States for the calendar year 
1903, pp. 1204, U. S. Geol. Sur., 1905. 
DIETZ, EDITH A. 
The Fall line. (Jour. Geog., vol. 4, pp. 244, May- June, 1905.) 
