

C N TENTS. 



Page 

 Art. I. — The Problem of the Cretaceous-Tertiary Boundary 

 in South America and the Stratigraphic Position of the i 

 San Jorge-Formation in Patagonia; by A. Windhausen 1 



II. — On the Rate of Solution of Silver in Chromic Acid; b} r 



R. G. Van Name and D. U. Him 54 



III. — Early Silurian Rocks of the Northern Peninsula of 



Michigan; by T. E. Savage and U. F. Crooks 59 



IV. — A Second Meteorite Find in Florida; by G. P. Merrill 64 



V. — On Mullanite, *& new Member of the Jamesonite Group, 



from Two Localities; by E. V. Shannon 66 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Solubility of Bismuth Oxyehloride in Hydrochloric 

 Acid and its Relation to Complex Formation, A. A. Notes, F. W. Hall, 

 and J. A, Beattie : Revision of the Cobalti-Nitrite Method for the 

 Determination of Potash, C. R. Haff and E. H. Schwartz, 71. — Estima- 

 tion of Arsenic in Organic Compounds, A. J. Ewins : Calorimeter for 

 Measuring Heats of Dilution, D. A. MacInnes and J. M. Braham, 72. — 

 Detection of Carbon in Inorganic and Organic Substances, E. Mueller : 

 Extreme Ultra- Violet Spectra of Helium, Hydrogen, and Mercury, 0. W. 

 Richardson and C. B. Bazzon, To. — Navigation, H. Jacoby, 74. — Practi- 

 cal Pyrometryt E. S. Ferry, G. A. Shook, and J. R. Collins, 75.— The 

 Mystery of Matter and Energy, A. C. Crehore, 76. 



Geology — Structure of the Himalayas, and of the Gangetic Plain, as eluci- 

 dated by Geodetic Observations in India, R. D. Oldham, 70. — The Origin 

 and Evolution of Life, H. F. Osborn, 77. — The Cretaceous Faunas of the 

 Northeastern Part of the South Island of New Zealand, H. Woods: 

 New and Little Known Gastropods from the Upper Cretaceous of Ten- 

 nessee, B. Wade: The " Mark Stirrup " Collection of Fossil Insects from 

 the Coal Measures of Comtnentry (Allier), Central France, H. Bolton: 

 Fossil Plants from Bolivia and their Bearing upon the Age of Uplift of 

 the Eastern Andes, E. W. Berry, 78.— West Virginia Geological Survey, 

 I. C. White: United States Bureau of Mines, Year Book for 1916, V. H. 

 Manning, 79. 



Obituary— E. HuLL, 80. 



