Geology and Mineralogy. 475 



telescope are discussed, and are shown to be independent of the 

 accommodation of the observer. Seventeen sets of curves for 

 as many different lenses are given, and an illustrative discus- 

 sion of one set of graphs is presented. — Bull. No. 311, Bureau 

 of Standards, pp. 341-369, 1917. h. s. u. 



II. Geology and Mineralogy. 



1. Publications of the United States Geological Survey; 

 George Otis Smith, Director. — Recent publications of the Sur- 

 vey are noted below. See earlier vol. 44, pp. 405-407, Nov., 

 1917 :— 



Thirty-eighth Annual Report of the Director. Pp. 176, 2 pis. 

 Noticed on p. 421, May, 1918. 



Topographic Atlas. — Fifty-seven sheets. 



Professional Papers. — No. 93. Geology of the Navajo 

 Country, a reconnaissance of parts of Arizona, New Mexico, 

 and Utah ; by H. E. Gregory. Pp. 161, 34 pis., 3 figs. Noticed 

 on p. 145, Feb., 1918. 



No. 96. The Geology and Ore Deposits of Ely, Nevada; by 

 A. C. Spencer. Pp. 189, 15 pis., 4 figs. 



No. 98. Shorter Contributions to General Geology, 1916 ; 

 David White, Chief Geologist. Pp. 401, 102 pis., 46 figs., 2 

 inserts. 



No. 99. Chemical Analyses of Igneous Rocks published from 

 1884 to 1913, with a critical discussion of the character and use 

 of analyses (a revision and expansion of Professional Paper 

 14) ; by H. S. Washington. Pp. 1201, 1 plate, 3 figs. Noticed 

 on p. 238, March, 1918. 



No. 105. Hydraulic-Mining Debris in the Sierra Nevada; 

 by G. K. Gilbert. Pp. 154, 34 pis., 33 figs. 



No. 108. Shorter Contributions to General Geology, 1917. 

 Chapters F, G, H, I, K. 



Mineral Resources of the United States for 1917. Numerous 

 advance chapters. 



Bulletins. — No. 597. Geology of Massachusetts and Rhode 

 Island ; by B. K. Emerson. Pp. 289, 10 pis., 2 figs. 



Nos. 651, 654. Spirit Leveling; R. B. Marshall, Chief 

 Geographer.— 651, Ohio, 1898-1916. Pp. 456, 2 pis.— 654, 

 Nevada, 1897-1916. Pp. 91, 1 plate. 



No. 656. Anticlines in the southern part of the Big Horn 

 Basin, Wyoming (a preliminary report on the occurrence of 

 oil) ; by D. F. Hewett and C. T. Lupton. Pp. 192, 32 pis., 

 12 figs. 



No. 658. Geologic Structure in the Cushing Oil and Gas 

 Field, Oklahoma, and its relations to the oil, gas, and water; 

 by Carl H. Beal. Pp. 64, 11 pis., 4 figs. 



