VI v CONTENTS. 



Number 172. 



Page 



Art. XXII. — Studies on the General Circulation of the 



Earth's Atmosphere ; by F. H. Bigelow . 277 



XXIII. — Mixed Crystals of Silver Sulphate and Dichromate ; 



by II. G. Van Name and R. S. Bosworth 293 



XXIV. — Osteology and Affinities of the Genus Stenomylus ; 



by F. B. Loomis '. 297 



XXV. — Refractive Index of Canada Balsam; by W. T. 



Schaller 324 



XXVI. — Stratigraphy of the upper Carboniferous in West 



Texas and Southeast New Mexico ; by G. B. Richardson 325 



XXVII. — Gravimetric Determination of Free Bromine and 

 Chlorine, Combined Iodine, and Oxidizing Reagents by 

 means of Metallic Silver ; by C. C. Perkins 338 



XXVIII. — Discharges of Electricity Through Hydrogen ; 



by J. Trowbridge, 341 



XXIX. — New Pennsylvania Meteorite ; by O. C. Farrington 350 



XXX. — Remarks on the Pentamerous Symmetry of the Cri- 



noidea ; by A. II. Clark . _ 353 



XXXI. — Association of Enargite, Covellite, and Pyrite from 



Ouray Co., Colorado ; by W. M. Thornton, Jr. 358 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Detection of Solium, Caesium, and Rubidium, W. C. 

 Ball, 360. — Volumetric Determination of Sulphates, Mitchell and Smith: 

 Action of Metals on Fused Caustic Soda, LeBlanc and Bergmann, 361. — 

 Transformation of Diamond into Graphite, Vogel and Tammakn : The 

 Johns Hopkins University Circular, No. 2 : Meteorologische Optik, F. M. 

 Exner, 362. 



Geology and Mineralogy — Publications of the U. S. Geological Survey, G. 0. 

 Smith, 363. — Geological Survey Canada, Department of Mines, R. W. 

 Brock, 365. — Kilauea and Mauna Loa, Hawaiian Volcanoes, W. T. 

 Brigham : Deviations from the Normal Order of Crystallization in Granite, 

 Mackie, 366.— New Occurrence of Lujavrite : Mercury Minerals from Ter- 

 lingua, Texas, Hillebrand and Schaller, 367. — The Rochester Collec- 

 tion of Meteorites ; Descriptive List of Specimens, K. S. Howard : A new 

 Meteorite from Georgia, G. P. Merrill, 368. 



Miscellaneous Scientific Intelligence. — Carnegie Institution of Washington : 

 Publications of the Allegheny Observatory of the University of Pittsburgh, 

 368. 



