REVIEWS 207 



The Manufacture of Gasoline and Benzene-Toluene from Petroleum 

 and Other Hydrocarbons. By W. F. Rittman, C. B. Dutton, 

 and E. W. Dean. U.S. Bureau of Mines, Bull. 114, Wash- 

 ington, 1916. Pp. 268, figs. 45, pis. 9, tables 83. 

 Contains the details of the methods employed by Rittman and his 

 associates, with the results obtained on both laboratory and factory 

 scale. The bulletin is of especial importance because it incorporates 

 the results of experimental work that has been given wide publicity by 

 the press. 



The demand for the bulletin has been so great that the edition for 

 free distribution was exhausted within a month of the date of its release 



by the Bureau. 



A. D. B. 



"An Arrangement of Minerals according to Their Occurrence," 



By E. T. Wherry and S. T. Gordon. Proceedings of the 



Academy of Natural Sciences of Philadelphia, August, 191 5, 



pp. 426-57. 



The classification is the most comprehensive attempt that has come 



to the notice of the reviewer, and likewise the most successful. The 



divisions made are rather too numerous for use in an elementary class, 



but are of great value to advanced students. Doubtless other divisions 



could be made, which might be more useful for specific studies, such as 



a further division of the hydrothermal deposits for studies of ore deposits, 



but in general the classification is an improvement over former attempts. 



A. D. B. 



Corundum, Its Occurrence, Distribution, Exploitation and Uses. 



By A. E. Barlow. Canada Dept. of Mines, Memoir 57. 



Pp. 377+vii, pis. xxviii, fig. 1, maps 2. 

 Corundum-bearing syenites, nephelite syenites, syenite pegmatites, 

 and anorthosites occur in three belts north of Lake Onatario. These 

 rocks are chiefly in the Laurentian gneiss, but are also found cutting the 

 Grenville series. The memoir is devoted to a detailed description of the 

 more important localities, including analyses and petrographic descrip- 

 tion of the rocks, and to the economic and technologic features of the 

 corundum industry, not only of Canada, but of the industry in various 



parts of the world. 



A. D. B. 



