208 REVIEWS 



Transactions of the American Institute of Mining Engineers, Vol. 

 XL VIII. New York, 1915. Pp. 753. 

 This volume contains papers and discussions of the New York meet- 

 ing of February, 19 14. It contains papers of interest to mining men, 

 geologists, metallurgists, oil producers, mill operators. The discussion 

 of the general topic of revision of mining law occupies a considerable 

 portion of the volume. More attention is given to the discussion of 

 petroleum than in any previous volume. Of particular interest in this 

 connection are papers by von Hofer and by Coste, presenting diametri- 

 cally opposed views on the origin of petroleum. These, with the discus- 

 sion they brought out, are worthy of the attention of anyone interested 

 in the geologv of petroleum deposits. 



A. D. B. 



Transactions of the American Institute of Mining Engineers. Vol. 

 XLIX. New York, 1915. Pp. 853. 



Contains papers and discussions of the Salt Lake City meeting of 

 August, 1 9 14. The greater number of papers bear on mining, milling, 

 and metallurgy, especially on the leaching of copper ores and the methods 

 of precipitation of copper from the solutions obtained. Forty-nine 

 titles are included. Many of the papers are illustrated. 



A. D. B. 



