9] 



VOLUMES XLI-L. 



487 



CHEMISTRY. 



mieson, 45, 416; nitrate, Chile, 

 Holstein, 49, 298. 

 Radium. See Radium. 



— sulphate, solubility, Lind, 

 Underwood, etc., 45, 327. 



Rare Earths, Spencer, 4g, 78. 



Rubidium and caesium, deter- 

 mination, Robinson, 45, 142. 



Silicon, thermo-chemistry, Mix- 

 ter, 42, 125. 



Silver, rate of solution in chromic 

 acid, Van Name and Hill, 45, 

 54; separation from mercury, 

 Zweigbergk, 41^ 215; volu- 

 metric method, new, Schneider, 



45, 4i6. 



Sodium. peroxide, use in combus- 

 tion calorimetry, Mixter, 43, 27. 

 Soils, organic matter in, Rather, 



46, 688. 



Solids, diffusion of, Van Or- 

 strand and Dewey, 41, 216. 



Stannous and lead halogen salts, 

 Rimbach and /Fleck, 41, 556. 



Succinic acid as a standard, 

 Peters and Sauchelli, 41, 244. 



Sucrose in acid vegetable juices, 

 Colin, 50, 393-. 



Sulphur, sulphide, estimation, 

 Drushel and Elston, 42, 155; 

 liquid, Kellas, 47, 297. 



Sulphurous acid, preparation, 

 Hart, 43, 411. 



Tellurium, arsenic, etc., detec- 

 tion and separation, Browning. 

 et al., 42, 106. 



Thorium, emanation method for 

 determination, Cartledge, 47, 

 134; oxidimetric determina- 

 tion, Gooch and Kobayashi, 

 45, 227; separation from iron, 

 Thornton, 42, 151. 



Tin, arsenic and antimony, sep- 

 aration, Welch and Weber, 42, 

 74; hydride, Peneth and Furth, 

 49, 298; and tungsten, new 

 method of separation, Travers, 



44? 479- 



Tri-iodide and tri-bromide equi- 

 libria, Van Name and Brown, 

 44, 105. 



Tungsten, occurrence, Runner 

 and Hartmann, 47, 225. 



Uranium, Chemistry, Pierle, 49, 

 146. 



— dioxide, preparation, Parsons, 

 43, 4.85. 



Vanadic acid, determination, 



CHEMISTRY. 



Gooch and Scott, 46, 427; Ed- 

 gar, 42, 365. 

 Vanadium, determination, Tur- 

 ner, 41, 339; 42, 109; in sedi- 

 mentary rocks, Phillips, 46, 



473- 

 Vapors in gases, estimation of, 



H. S. and M. D. Davis, 46, 688. 

 Weighing, analytical, Wells, 49, 



375; deflection method of, 



Brinton, 48, 390. 

 Yttrium, separation, Bonardi 



and James, 41, 142. 

 Zinc, determination, Jamieson, 



46, 614; Howden, 47, 70. 

 Zirconium, determination, Lun- 



dell and Knowles, 48, 67; 



Smith and James, 50, 393. 

 Chert, origin, Tarr, 44, 409; 45, 

 149; Van Tuyl, 45, 449. 



— California, Davis, 47, 234; Kan- 

 sas, Twenhofel, 47, 407; Mis-' 

 souri, formation, Dean, 45, 411. 



Cincinnati, geology, Fenneman, 43, 

 172. 



Clark, A. H., Existing Crinoids, 41, 

 150. 



Clark, B. M., Introduction to Sci- 

 ence, 45, 420; Laboratory Manual, 

 45, 420. 



Clark, T. H., Agelacrinitid, from 

 Chazy of New York, 50, 69. 



Clarke, F. W., Data of Geochemis- 

 try, 41, 376; constitution of meli- 

 lite and gehlenite, 43, 476, 



Clay, dolomitic, Ries, 44, 316. 



Cleland, H. F., Geology, 42, 282. 



Climatic Control, Humphreys, 49, 

 305; fluctuations, pleionian cy- 

 cle of, Arctowski, 42, 27. 



Coal beds in West Virginia, Hen- 

 nen, 46, 770. 



— Coal Industry, 42, 503; and 

 Uses, Bone, 47, 135; water con- 

 tent, genesis and nature, Mack 

 and Hulett, 43, 89; and Smyth, 

 45, 174; origin of brown, Steven- 

 son, 43, 211. 



Coast Survey, United States, an- 

 nual report, 1915, 4 1 , 3°5; 1916, 

 43, 253; 1918, 47, 309; 1919, 49, 

 309. 



Centennial celebration, 42, 



505. 



Magnetic chart, 41, 466. 



degree awarded to Wm. 



Bowie, 48, 249. 

 Cockerell, T. D. A., insects in Bur- 



