Vlll CONTENTS. 



Number 240. 



Page 



Art. XLI. — A Metallographic Description of Some Ancient 

 Peruvian Bronzes from Machu Picchu ; by C H. 

 Mathewson _. - 525 



XLIL — A New Cephalopod from the Silurian of Pennsyl- 

 vania; by Ruth Raeder Mook _ 617 



XLIII. — Activity of Maun a Loa, Hawaii, December-January, 



1914-15; by T. A. Jaggar, Jr 621 



XLIV. — Decomposition of Mineral Sulphides and Sulpho- 

 Salts by Thionyl Chloride; by H. B. North and C. B. 

 Conover _ 640 



XLV. — On Simple and Mixed Alkyl Phosphates ; by W. A. 



Drushel 643 



XL VI. — Two New Fresh-water Gastropods from the Meso- 



zoic of Arizona ; by W. I. Robinson 649 



XLVII. — The Ordovician Cynthiana Formation ; by A. M. 



Miller 651 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Annual Keport of the International Committee on 

 Atomic Weights: Analysis of the Non-Ferrous Metals, F. Ibbotson and 

 L. Aitchison: A Course in Quantitative Chemical Analysis, N. Knight, 

 658.— Household Chemistry for the Use of Students in Household Arts ; 

 H. T. Vulte: Chemical German, F. C. Phillips: A Cornpend of Medical 

 Chemistry, H. Leffman, 659. — Sounds Resulting from Firing Modern Can- 

 non and Rifles, M. Agnus, 660.— Fluorescence and Eesonance of Sodium 

 Vapor, R. J. Strutt: Elementary Lessons in Electricity and Magnetism. 

 S. P. Thompson, 661.— A Treatise on Light, R. A. Houston, 662. 



Geology — Strength of the Earth's Crust, J. Barrell: A Text-Book of Geol- 

 ogy, L. V. Pirsson and C. Schuchert. 663. — Grundlagen der physicalisch- 

 chemischen Petrographie, H. E. Boeke, 664. — Papers from the Geological 

 Department of Glasgow University, 666. 



Miscellaneous Scientific Intelligence — National Academy of Sciences, 666. — 

 Memoirs of the National Academy of Sciences : Craniometry of the 

 Southern New England Indians, Vera M. Knight, 667. — Publications of 

 the British Museum of Natural History, 668.— Contributions from the 

 Princeton Observatory: Publications of the Cincinnati Observatory, J. G. 

 Porter: Nature and Science on the Pacific Coast, 669. — Alining World 

 Index of Current Literature, G. R. Sisley: Les Prix Nobel en 1918: Lee- 

 ward Islands of the Hawaiian Group, C. Elschner, 670. 



Obituary — R. Meldola: E. A. Minchin: T. Albrecht: W. Tassin, 670. 



Index to Volume XL, 671. 



