120 The American Geologist. February. ish>5 
OLIPHANT. F. H. 
Natural Gas. (Min. Res. U. S., 1903, jip. 719-745.) 
OSBORN, H. F. 
The present problems of paleontology. (.Pop. Sci. Month., vol. 
66. pp. 226-243, Jan., 1905.) 
PARKER. E. W. 
Coal. (Min. Res. U. S.. 1903, pp. 351-539.) 
PARKER. E. W. 
Coke. (.Min. Res. U. S.. 1903. pp. 539-609.) 
PARKER. E. W. 
Gas. Coke. Tar and Ammonia at gas works and in retort coke 
ovens. (Min. Res. U. S.. 1903. pp. 609-635.) 
PATTON. H. B. 
Fault-planes in the Dakota fire-clay beds at Golden, Colo. [Ab- 
stract]. (Bull. G. S. A., vol. 15, p. 583.) 
PEPPEL. S. V. 
Sand-Lime Brick Industry. ^Min. Res. U. S.. 1903. pp. S66-S83.) 
PHILLIPS. F, C. 
Chemical composition of natural gas. (West Virginia G^ol. 
Sur.. vol. lA. 513-552.) 
PRATT, JOS. H. 
Lithium. (Min. Res. U. S.. 1903, pp. 313-317.) 
PRATT. JOS. H. 
Talc, soapsione and abrasive materials. (Min. Res. V. S., 1903, 
pp. 779-1017.) 
PRATT, J. H. (JOS. STRUTHERS and). 
Tin. (Min. Res. U. S.. 1903, pp. 335-351.) 
PRATT. J. H. 
Steel-hardening metals. (Min. Res. U. S.. 1903, pp. 285-309.) 
PRATT, J. H. 
Sulphur, barytes. mineral paints asbestos. (Min. Res. U. S., 
1903. pp. 1073-1111.) 
PRATT, J. H. 
Fluorspar and Cryolite. (Min. Res. V. S., 1903, pp. 1029-1033.) 
PRATT. J. H. 
Graphite. (Min. Res. U. S.. 1903. pp. 1121-1131.) 
PRATT, J. H. 
Monazite and zircon. (Min. Res. U. S., 1903, pp. 1163-1171.) 
RANSOME, F. L. (WALDEMAR LINDGREN and). 
Report of progress in the Geological Resurvey of the Cripple 
Creek district. Colorado. (Bull. 254, T. S. G. S., pp. 36, 1904.) 
RICKARD, T. A. 
The Copper mines of lake Superior. XII. Final paper. (Eng. 
Min. Jour., vol. 7S, p. 1025, Dec. 29. 1904.) 
RIES, HEINRICH. 
Flint and Feldspar. (Min. Res. V. S.. 1903, pp. 1117-112L) 
