64 Scientific Intelligence. 



No. 13. Resume of Producer-Gas Investigations. Oct. 1, 1904- 

 June 30, 1910 ; .by R. H. Fernald and C. D. Smith. Pp. 393 ; 

 ] 2 plates, 250 figures. 



No. 14. Briquetting Tests of Lignite at Pittsburg, Pa., 1908-9, 

 with a chapter on Sulphite-Pitch Binder ; by Charles L. Wright. 

 Pp. 64 ; 11 plates, 4 figures. 



No. 15. Physical and Chemical Properties of the Petroleums 

 of the San Joaquin valley, Cal. ; by I. C. Allen and W. A. 

 Jacobs. With a chapter on Analyses of Natural Gas of Southern 

 California ; by G. A. Burrell. 



Several Technical Papers have also been issued, and further the 

 following Miners' Circulars : No. 3 on Coal-dust Explosives ; by 

 G. S. Rice ; No. 4, on Use and Care of Mine-rescue breathing 

 Apparatus ; by James W. Paul. 



No. 5. Electrical Accidents in Mines; their Prevention and 

 Treatment; by H. H. Clark. 1911. N 



3. Geological Survey of JVew Jersey. Henry B. Kummel, 

 State Geologist. Iron Mines and Mining in JVew Jersey; by 

 William S. Bayley. Vol. VII of the Final Report Series of 

 the State Geologist. Pp. xv, 512 ; 13 plates, 31 figures, 2 pocket 

 maps. Trenton, N. J., 1910. — A large amount of data relating 

 to the iron ores of New Jersey, distributed through some forty 

 volumes of the Annual Reports, have been brought together in 

 the present volume, which is thus a thorough presentation of all 

 that is important in regard to the iron-mining industry of the 

 state. Although the work is essentially a compilation, the thor- 

 oughness with which the facts have been assembled will be 

 appreciated from the statement that every mine hole has been 

 revisited and every mine dump carefully examined. As is well 

 known, the iron ores of New Jersey are chiefly magnetite, which 

 occurs in the pre-Cambrian rocks of the state. The larger part 

 of the volume is devoted, consequently, to the general statement 

 of the occurrences and origin of the magnetite, followed by 

 detailed facts in regard to individual mines. An account is also 

 given of the bog ores and of limonite, which in former years 

 were extensively mined, although of relatively small importance 

 at the present time. The occurrences of hematite are Jimited in 

 number and have never been extensively mined. 



4. Geological Survey of Alabama ; Eugene Allen Smith, 

 State Geologist. — The following Bulletins have recently appeared: 



No. 10. Reconnoissance Report on the Fayette Gas Field, 

 Alabama ; by M. J. Munn. Pp. 66 ; 2 plates, 2 maps. Pre- 

 pared in cooperation with the U. S. Geological Survey. 



No. 11. Roads and Road Materials of Alabama ; by William 

 F. Prouty. Pp. 148 ; 20 plates, 2 figures. 



5. The Data of Geochemistry^ Second Edition ; by Frank 

 Wigglesworth Clarke. Pp. 782 (U. S. Geol. Surv., Bull. 491). 

 — The first edition of this invaluable work was published in 1908 

 and noticed in this Journal at that time (see vol. xxv, p. 458). 

 In its revised and enlarged form it now appears with sixty-six addi- 



