CONTENTS. 



Page 

 Art. XLVIL: — Preparation of Urano-Uranic Oxide, U 3 8 , 

 and a Standard of Radio-activity ; by II. N. McCoy and 



•G. C. Ashman 1 521 



XLY1II. — Telemeter with Micrometer Screw Adjustment ; 



by F. E. Weight . . . . 531 



XLIX. — Device to Aid in the Explanation of Interference 



Phenomena ; by F. E. Wright 530 



L. — Descriptions of Tertiary Plants, II ; by T. D._ A. 



COCKERELL . 53*7 



LI. — Three Contact Minerals from Velardena, Durango, 

 Mexico. ( Gehlenite, Spurrite and Ilillebrandite ; ) by 

 F.E.Wright _ 545 



LII. — Volumetric Estimation of Potassium in Animal Fluids; 



by W. A. Drushel . 555 



LIII. — Meso-Silurian Deposits of Maryland ; by Wm. F. 



Prouty.* . ' 563 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Eate of Production of Helium from Eadium, J. 

 Dewas : Radium in Tufa Deposits, Schlundt : Compound of Cobalt with 

 Carbon Monoxide, Mcnd, Hirtz and Cowaf, 575. — Cyanide Processes, E. 

 B. Wilson r Magnetic Rotation of Electric Discharge, D. N. Mallik : 

 Directive System of Wireless Telegraphy, E. Bellini and A. Tosi : Positive 

 Rays, J. J.. Thomson, 576. — Radium Emanation in the Atmosphere near 

 the Earth's Surface, Eve : Absorption of Rontgen Rays, W. Seitz : Zee- 

 man Effect in Solar Vortices, G. A. Hale : Study of Stellar Evolution, 

 an Account of some Recent Methods of Astrophysical Research, G. E. 

 Hale, 577. — Korpuskulartheorie der Materie, J. J. Thomson and G. 

 Siebert. — Magneto- und Eleetro-Optik, W. Voigt : Evolution of Forces, 

 G. Le Bon, 579. — Experimental Electricity, G. F. C. Searle : The New 

 Physics and its Evolution, L. Poincare : Principles of Mechanics, H. 

 Crew, 580. 



Geology and Mineralogy — West Virginia Geological Survey, I. C. White : 

 Florida State Geological Survey, E. H. Sellards, 581. — Wisconsin Geo- 

 logical and Natural History Survey : Geological Survey of Cape of Good 

 Hope, 582. — Bergensfeltet og tilstodende Trakter i senglacial og postglacial 

 Tid, C. F. Kolderup : Mikroskopishe Physiographie der massigen Ge- 

 steine ; Ergussgesteine, H. Rosenbusch, 583. — Die Fossilen Insekten und 

 die Phylogenie der rezenten Formen, A. Handlirsch : Gahnite, G. M. 

 Flint : Hints for Crystal Drawing, M. Reeks, 584. 



Botany — Systematic Anatomy of the Dicotyledons, H. Solereder, 585. — 

 Text-Book of Botany and Pharmacognosy, H. Kraemer, 586. — Die 

 Gestalts- und Lage veranderung der Pflanzen-Chromatoplioren . G. Senn, 

 587. 



Miscellaneous Scientific Intelligence — National Academy of Sciences : 

 National Antarctic Expedition, 1901-1904, 588. — Road Preservation and 

 Dust Prevention, W. P. Judson, 589. — Ostwald's Klassiker der Exakten 

 Wissenschaften : Elementary Dynamics, E. S. Ferry : Plane and Solid 

 Geometry, E. A. Lyman, 590. — Moral Instruction and Training in Schools 

 M. E. Sadler-: Practical Exercises in Physical Geography, W. M. Davis, 

 Twenty-Sixth Annual Report of th* Brw-eau of American Ethnology, 591. 



Obituary-— William K. Brooks, 591. ' . #fe IfA Jj MMf 



9 10 



