306 Scientific Intelligence. 



chiefly of economic character have been received; the director 

 of the Survey is the author unless otherwise stated : 



No. 1. Effect of the war on the price of coal in Pennsylvania. 



No. 2. Oil and gas in Southeast Pennsylvania. 



No. 3. Development and probable life of gas pool at McKees- 

 port, Penn. 



No. 4. Decline of McKeesport oil pool. 



No. 7. A high-grade building stone in Greene Co., Penn. 



No. 12. Gas wells on Pollock Run, Westmoreland Co., Penn. ; 

 by J. French Robinson. 



No. 14. Future Sources of power. 



No. 16. Geology of oil and gas in relation to coal. 



No. 23. Coal beds in Cambrian Co., Penn. • by J. D. Sisler. 



No. 24. Coal beds in Greene Co. ; by J. D. Sisler. 



No. 25. Coal reserves in Greene Co. ; by John F. Reese. 



6. United States Bureau of Mines; H. Foster Bain, Director. 

 — In addition to the usual bulletins, technical papers and miners' 

 circulars (See, 50, 470, 1920; 1, 288, 1921). The following con- 

 tribution especially deserves notice: 



Summarized Reports of principal Investigations being con- 

 ducted by the Bureau of Mines for the year beginning July 1, 

 1921 ; compiled by J. D. Secrest, Washington, September, 1921 

 (a manifolded edition of 185 pages, including list of investi- 

 gators). The fact that the alphabetized list of these investiga- 

 tions covers thirteen pages in this edition gives some idea as to 

 the variety and extent of the work of the Bureau. This embraces 

 the whole field, from the subject of mine disasters, their causes 

 and means of prevention, to researches about radium and the 

 rare gases. The substance of each of the papers here included is 

 given in clear, condensed form. 



Recent Bulletins issued are as follows : 



No. 117. Structure in Paleozoic bituminous coals ; by Rhein- 

 hardt Thiessen. 250 pp., 160 pis. (80 cents.) 



No. 183. Abstracts of current decisions on mines and mining, 

 reported from May to August, 1919 ; by J. W. Thompson. 

 167 pp. 



No. 184. The manufacture of sulphuric acid in the United 

 States ; by A. E. Wells and D. E. Fogg. 216 pp., 13 pis. 36 figs. 

 (40 cents.) 



No. 185. Pennsylvania mining statutes, annotated; by J. W. 

 Thompson. 1921. 1221 pp. ($1.00.) 



No. 189. Bibliography of petroleum and allied substances in 

 1918 ; by E. H. Burroughs. 180 pp. 



No. 191. Quality of gasoline marketed in the United States; 

 by H. H. Hill and E. W. Dean. 270 pp., 22 figs. 



No. 194. Some principles governing the production of oil 

 wells; by Carl H. Beal and J O. Lewis. 58 pp., 2 pis., 8 figs. 



