Monthly Author's Catalogue. 55 
PARK, JAMES. 
Theories of Vein Formation. (Eng. Min. Jour., vol. 79, p. 993, 
May 25, 1905.) 
PRINDLE, L. M. (and F. L. HESS). 
Rampart placer reg4on. (U. S. G. S., Bull. 259, pp. 104-119, 
1905.) 
PURINGTON, C. W. 
Methods and costs of gravel and glacer mining in Alaska. (U. 
S. G. S., Bull. 259, pp. 32-41, 1905.) 
PYNCHON, W. H. C. 
Drilled wells of the Triassic area of the Connecticut valley. 
(Wat. Sup. Irr. Pap., No. 110, pp. 65-94, 1905.) 
RAYMOND, P. E. 
Note on the names Amphion, Harpina and Platymetopus. (Am. 
Jour. Sci., vol. 19, pp. 377-379, May, 1905.) 
READ, THOMAS T. 
Platinum and Palladium in Certain Copper Ores. (Eng. Min. 
Jour., vol. 79, p. 985, May 25, 1905.) 
ROWLEY, R. R. 
Missouri paleontology. (Am. Geol., vol. 35, p. 301, May, 1905.) 
RUEDEMANN, R. 
Structure of some primitive cephalopods. (Rep. N. Y. State 
paleontologist, 1903, pp. 296-343, 1905.) 
RUSSELL, I. C. 
Preliminary report on the geology and water resources of 
central Oregon. Bull. U. S. G. S., No. 252, pp. 138, pis. 24, 1905. 
SHIMEK, B. 
Additional Note on Helicina Occulta. (Jour. Geol. vol. 13, pp. 
232-238, Apr.-May, 1905.) 
SHIMER, H. W. 
Upper Siluric and Devonic fauna of Trilobite mountain. (Rep. 
N. Y. State paleontologist, 1903, pp. 173-270, 1905.) 
SPENCER, A. C. 
The Treadwell ore deposits. (U. S. G. S., Bull. 259, pp. 69-87, 
1905.) 
SPENCER, J. W. 
Physiographic improbability of land at the North Pole. (Am. 
Jour. Sci., vol. 19, pp. 333-341, May, 1905.) 
SPENCER, J. W. 
Bibliography of submarine valleys off North America. (Am. 
Jour. Sci., vol. 19, pp. 341-348, May, 1905.) 
