Geology and Mineralogy. 471 



Contains more than 20,000 terms and nearly 30,000 definitions, 

 covering technical and local usage in mining and metallurgy. 



No. 112. Mining and preparing domestic graphite for crucible 

 use ; by G. D. Dub and F. G. Moses. Pp. 90, 5 pis., 20 figs. 



No. 173. Manganese : Uses preparation, etc. ; by C. M. 

 Weld and others. Pp. 209, 13 figs. 



No. 180. Bibliography of petroleum and allied substances, 

 1917 ; by E. H. Burroughs. Pp. 170. 



No. 182. Casing troubles and fishing methods in oil wells; 

 by Thomas Curtin. Pp. 48 3 pis., 15 figs. 



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

 States; by A. E. Wells and D. E. Fogg. Pp. 216, 15 pis., 

 36 figs. 



No. 196. Coal mine fatalities in the United States, 1919 ; by 

 A. H. Fay. Pp. 86, 1 fig., 38 tables. 



Numerous Technical Papers have also been issued. 



It is announced that H. S. Mulliken, of Lexington, Mass., 

 has been appointed metallurgical engineer and has been assigned 

 as an assistant to the Director in special professional work 

 connected with the Bureau. 



9. The Production of Platinum in 1919 — The Production of 

 Precious Stones in 1919; by George F. Kunz. Reprinted from 

 Mineral Industry, volume XVIII, pp. 549 to 5.67, 584 to 613. 



Platinum and allied metals in 1919; by James M. Hill. From 

 Part I of Mineral Resources of the United States, pp. 9 to 18. 

 (U. S. Geol. Survey.) — As is well known, the situation with 

 respect to the supply and price of platinum has been unprece- 

 dented ever since 1914. The average price in New York for the 

 troy ounce in 1914 was $45, which had increased in December 

 1919 to more than $151. In 1919, in addition to the production of 

 54,550 oz., 25,000 oz. were released by our Government, so that 

 upwards of 90,000 oz. were available. The supply is, however, 

 far less than the demand and this is likely to remain true until 

 the resources of Russia are once more made available. It is 

 interesting to note that in the year under consideration, 56% 

 of platinum went into jewelry, 19% was used for electrical 

 purposes, 14% for dental purposes, and the remainder for 

 chemical and miscellaneous objects. In 1902 this country 

 produced only an insignificant amount, but this had increased 

 in 1919 to 824 oz., all from domestic sources. The total amount 

 recovered by refiners was 54,400 oz. in 1918 and 40,220 in 1919, 

 a large part was from scrap material. The imports of platinum 

 and allied metals in 1919 were approximately 20% more than 

 those in the preceding year. In 1918, Columbia furnished 23,000 

 oz. and Russia in Asia 21,000 oz. In 1919 the production of 

 Columbia had increased somewhat, but the amount available from 

 Asiatic Russia was reduced to 400 oz. In addition, England 

 and France contributed 26,400 oz. in 1919, chiefly of the refined 



