Geology and Natural History, 81 



price on each bulletin (usually 25 or 30 cents). Orders should be 

 addressed to the Superintendent of Documents, Government 

 Printing Office, Washington, D. C. 



Bulletins: No. 107. Prospecting and mining of copper ore at 

 Santa Rita, New Mexico, by D. F. Ma.c Donald and Chakles 

 Enzian. Pp. 122; 10 pis., 20 figs. 



No. 109. Operating details of gas producers, by R. H. 

 Fernald. Pp. 74. 



No. ill. Molybdenum ; its ores and their concentration, with 

 a discussion of markets, prices, and uses, by F. W. IIokton. 

 Pp. 132; 18 pis., 2 figs. 



No. 119. Analyses of coals purchased by the Government 

 during the fiscal years 1908-1915 ; by G. S. Pope. Pp. 118. 



No. 121. The history and development of gold dredging in 

 Montana; by IIennen Jennings; with a chapter on placer min- 

 ing methods and operating costs, by Charles Janin. Pp. 63; 

 29 pis., 1 fig. 



No. 122. The principles and practice of sampling metallic 

 metallurgical materials, with special reference to the sampling of 

 copper bullion; by Edward Keller. Pp. 102; 13 pis., 31 figs. 



No. 124. Sandstone quarrying in the United States, by Oliver 

 Bowles. Pp. ix, 143, 6 pis. 



No. 125. The analytical distillation of petroleum, by W. F. 

 RiTTMAN and E. W. Dean. Pp. 79; 1 pL, 16 figs. 



No. 126. Abstracts of current decisions on mines and mining 

 reported from January to April, 1916; by J. W. Thompson. 

 Pp. xi, 900. 



No. 128. Refining and utilization of Georgia kaolins, by Ira 

 E. Sproat. Pp. 59; 5 pis., 11 figs. 



No. 143. Abstracts of current decisions on mines and mining, 

 reported from May to August, 1916; by J. W. Thompson. 

 Pp. 72. 



An address delivered by Dr. Manning in Washington, May 25, 

 1917, before the editorial conference of the Business Publishers 

 Association, gives an interesting and instructive account of 

 the present petroleum and gasoline situation in this country, 

 due chiefly to the very large increase in the number of motor 

 vehicles. 



2. Canada^ Department of Mines. — Of the many publications 

 issued by the Canadian Department of Mines in recent months, 

 the following should be specially mentioned (see vol. xli, pp. 467- 

 469, and vol. xlii, p. 84) : 



(1.) Geological Survey Branch. R. W. Brock, Director. 

 Memoirs. — No. 51. Geology of the Nanaimo Map- Area ; by 

 Charles H. Clapp. Pp. vii, 135 ; 13 pis., 10 figs. 



No. 73. The Pleistocene and Recent Deposits of the Island of 

 Montreal ; by J. Stansfield. Pp. iv, 80 ; 2 maps, 2 pis., 10 figs. 



No. 83. Upper Ordovician Formations in Ontario and Quebec ; 

 by A. F. FoERSTE. Pp. viii, 277, vii ; 1 colored map, 8 figs. 

 Noticed on p. 438, vol. xlii. 



Am. Jour. Sci.— Fourth Series, Vol. XLIY, No. 259.— July, 1917. 



