CONTENTS. 



Page 



Art. XLYI. — Missourite, a new Leucite Rock from the 

 Highwood Mountains of Montana ; by W. H. Weed 



and L. Y. Pirsson _ 315 



XLVII. — Silveria Formation ; by O. H. Hershey 324 



XL VIII. — Viscosity of Mixtures of Liquids ; by C. E. Line- 



BARGER _ 331 



XLIX. — Volume Measurement of an Air Thermometer Bulb ; 



by W. G. Cady 341 



L. — Effect of Residual Viscosity on Thermal Expansion ; by 



H. D. Day ._ 342 



LI. — Induction Coefficients of Hard Steel Magnets ; by B. O. 



Peirce _ - ._ 347 



Lll. — Application of Certain Organic Acids to the Estima- 

 tion of Vanadium; by P. E. Browning and R. J. 

 Goodman 355 



LIII. — The Determination of Oxygen in Air and in Aqueous 



Solution; by D. A. Kreider 361 



LIV. — Local Deformation of Strata in Meade County, Kan- 

 sas, and Adjoining Territory (Preliminary) ; by E. 

 Ha WORTH _.. 368 



LV. — Amphibian Footprints from the Devonian ; by O. C. 



Mai^sh - 374 



LVL — Geology of Block Island (Continued) ; by O. C. 



Marsh 375 



SCEENTIFIC INTELLIGENCE. 



Chemistry and Physics — Lucium, a supposed new element, M. P. BARRiiiRE: 

 Occurrence of gallium in the clay-ironstone of the Cleveland district, Yorkshire, 

 "W. N. Hartley and H. Ramage, 378.— Flame temperatures, W. J. WAaGENER: 

 Liquefaction of Helium, K. Olszewski, 379. — Photometry of the ultra violet 

 portion of the Solar Spectrum, H. T. Simon: Electrical Indices of Refraction, 

 P. Drude : Electrical Oscillations in a conducting- sphere capable of polariza- 

 tion, Rydberg, Kayser and Runge, 380. — Magnetic Detector of Electrical 

 Waves, E. Rutherford: Discharge of an electrified body by means of the 

 Tesla Spark, P. J. Smith: Nature of the Rontgen rays, J. J. Thomson, 381. — 

 Absolute hardness, P. Auerbach: Determination of Freezing Points, J. A. 

 Harker, 390. — Rontgen Rays and Phenomena of the Anode and Cathode, E. 

 P. Thompson and W. A. Anthony: Journal of Physical Chemistry, 392. 



Geology and Natural History — Geology of Somali-land, 393. — Text-Book of 

 Palaeontology, K. A. von Zittel, 394.— Structural details in the Green Moun- 

 tain region and in eastern New York, T. N. Dale, 395. — Mineral Industry: 

 Botanical Gazette : Dualistic Theory of Descent, 396. 



Miscellaneous Scientific Intelligence — British Association for the Advancement 

 of Science: Report of the Sixth Meeting of the Australasian Association for 

 the Advancement of Science: Ostwald's Klassiker der Exacten Wissenschaften, 

 397. 



Obituary— M. Hippolyte Fizbau: Sr. Luigi Palmieri, 398. 



