CONTENTS. Vll 



NumlDer 11. 



Page 



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

 Highwood Mountains of Montana ; by W. H. Weed 

 and L. V. Pirsson ._ - _.. 315 



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



XLVIIL — 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. 

 Haworth 368 



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



Marsh 374 



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



Marsh 375 



SCIENTIFIC 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. Waggener: 

 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 ia 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, F. J. Smith: Nature of the Rontgeu rays, J. J. Thomson, 381. — 

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

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

 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 Fizeau: Sr. Luigi Palmieri, 398. 



