CONTENTS. 



Number 243. 



Art. XII. — Explosive Ejectamenta of Kilauea; by S. Powers 227 



XIII. — Succinic Acid as a Standard; by C. A. Peters and 



V. Sauchelli -. 244 



XIV. — Conductivity Cell for Electro-titration; by II. E. 



RoBBINS , 249 



XV. — Evidence of the Ligamentum Teres in Nebraska 



Proboscidea; by E. H. Barbour 251 



XVI. — Fossiliferous Miocene Bowlders from Block Island, 



R. I; by H. W. Shimer "... 255 



XVII. — The Summation of Chemical Analyses of Igneous 



Rocks; by H. H. Robinson i 257 



XVIII. — Coniferous Woods of the Potomac Formation; by 



E. W. Sijsnott and H. H. Bartlett 276 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics^— Density of Lead from Radioactive Minerals, T. W. 

 Richards and C. Wadsworth, 3d, 293. — Representative Procedures in 

 Quantitative Analysis, F. A. Gooch: Molecular Volumes of Liquid Chem- 

 ical Compounds, G. LeBas, 294. — Handbook of Colloidal Chemistry, W. 

 Ostwald: Critical Temperature of Mercury, J. Bender, 295. — Thermal 

 Conductivity of Neon, E. Bannawitz, 296. — Relativity and the Elec- 

 tron Theory, E. Cunningham: Telephone and Telephone Exchanges, 

 J. E. Kingsbury: A Course of Modern Analysis, E. T. Whittaker and 

 G. N. Watson, 297.— Edinburgh Mathematical Tracts, 298. 



Geology — Pebble Phosphates of Florida, E. H. Sellards, 299. — Phosphate 

 Deposits of Florida. G. C. Matson: A Correction, F. Bascom, 300. — Cam- 

 brian Trilobites, C. D. Walcott, 301. — Introduction to the Geology of 

 Dayton (Ohio) and vicinity, A. F. Foerste: Studies in Kdrioasteroidea, 

 I-IX, F. A. Bather: Handbuch der Regionalen Geologie: Geologia Ele- 

 mentar, Brazil, J. C. Branner, 302. 



Miscellaneous Scientific Intelligence — Report of the Secretary of the Smith- 

 sonian Institution for 1915, C. D. Walcott, 303. — Memorial Volume of 

 the Transcontinental Excursion of 1912 of the American Geographical 

 Society of New York, 304. — Publications of the Carnegie Institution of 

 Washington: Annual Report of the Superintendent of the United States 

 Coast and Geodetic Survey, E. L. Jones, 305. — Publications of the United 

 States Naval Observatory, J. A. Hoogewerff: Publications of the Alle- 

 gheny Observatory of the University of Pittsburgh, 306, 



Obituary — D. G. Elliot: J. Rhys: J. C. Moberg: H. Debus, 306. 



