VI CONTENTS. 



Number 160. 



Page 



Art. XX. — Permeabilities and the Reluctivities, for very 

 Wide Ranges of Excitation, of Normal Specimens of 

 Compressed Steel, Bessemer Steel and Norway Iron 

 Rods ; by B. O. Peirce _ 273 



XXI. — Ice Movement and Erosion along the Southwestern 



Adirondacks ; by W. J. Miller 289 



XXII. — Estimation of Vanadic and Arsenic Acids and of 

 Vanadic and Antimonic Acids, in the Presence of One 

 Another ; by G. Edgar 299 



XXIII. — Method for the Iodometric Estimation of Silver 

 Based upon the Use of Potassium Chromate as a Pre- 

 cipitant ; by F. A. Gooch and R. S. Bosworth 302 



XXIV. — Brown Artesian Waters of Costilla County, Colo., 

 their relations to Certain Deposits of Natron or Soda, 

 and what they teach ; by W. P. Headden 305 



XXV.— Volumetric Determination of Small Amounts of 



Arsenic ; by L. W. Andrews and H. V. Faer 316 



XXVI. — Preliminaiy Report on the Messina Earthquake of 



December 28, 1908 ; by F. A. Perret . 321 



XXVIT. — New Connecting Link in the Genesis of Fulgur ; 



by C. J. Maury ...... 335 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Method for Calculating the Boiling-points of 

 Metals, F. Krafft and Knocke : Some Properties of the Radium Emana- 

 tion, Rutherford, 336. — Method for Preparing Hydrogen Phosphide, 

 Matignon and Trannot : The Theory of Valency, J. N. Friend : Recent 

 Advances in Organic Chemistry. A. W. Stewart. 337. — Michelson's Ethel- 

 Research, E. Kohl : Influence of Pressure upon Thermoelectric Force, H. 

 Horig : Aluminum Cell as a Condenser, J. de Modzelewski : Changes in 

 the Spectra of Gases submitted to the Magnetic Field, A. Dufour : Die 

 elektrischen Eigenschaften und die Bedeutimg des Selens fiir die Elektro- 

 technik. C. Ries, 338. — Physics for Secondary Schools, C. F. Adams : 

 Elements of Physics. G. A. Hoadley, 339. 



Geology and Natural History — Iowa Geological Survey Report for 1907, S. 

 Calvtn : Oklahoma Geological Survey, C. N. Gould, L. L. Hutchison 

 and G. Nelson, 339. — Glaciation of Uinta and Wasatch Mountains, W. W. 

 Atwood : Glacial Waters in Central New York, H. L. Fairchild : Ground 

 Waters of Indio Region, California, W. C. Mendenhall, 340.— Die Alpen im 

 Eiszeitalter, A. Penck und E. Bruckner : Geological Survey of Western 

 Australia, A. G. Maitland : Die Geologischen Grundlagen der Abstaui- 

 mungslehre, G. Steinmann, 341. — Mineralien-Sainmlungen, W. Prendler: 

 Jadeite from Upper Burma, A. W. G. Bleeck, 343. — Rubies from Upper 

 Burma, A. W. G. Bleeck : New Group of Manganates, L. L. Fermor : 

 Die Bliitenflanzen Afrikas, F. Thonner, 344. — Schwendeners Vorlesungen 

 iiber mechanische Probleme der Botanik. Holtermann : Plant Study with 

 Directions for Laboratory and Field Work, Meier, 345. 



Miscellaneous Scientific Intelligence — Carnegie Foundation for the Advance- 

 ment of Teaching ; Report of the President, H. S. Pritchett, and Treas- 

 urer, T. M. Carnegie, 346. — Carnegie Institution of Washington, 347. — 

 Report of the Superintendent of the Coast aud Geodetic Survey, O. H. 

 Tittmanx : Principal Facts of the Earth's Magnetism, 348. 



