CONTENTS. Vll 



Number 59. 



Page 

 Art. XXXIII. — Elaboration of the Fossil Cycads in the 



Yale Museum ; by L. F. Ward. (With Plates II-IV). 327 



XXXIV. — Chemical Composition of Turquois ; by S. L. 



Penfield , 346 



XXXV. — Quartz muscovite rock from Belmont, Nevada ; the 



Equivalent of the Russian Beresite; by J. E. Spltrr 351 



XXXVI. — Volumetric Estimation of Copper as the Oxalate, 

 with Separation from Cadmium, Arsenic, Tin and Zinc ; 

 by C. A. Peters 359 



XXXVII. — Synopsis of the Collections of Invertebrate Fossils 

 made by the Princeton Expedition to Southern Pata- 

 gonia ; by A. E. Ortmann '368 



XXXVIII.— Cathode Stream and X-Light ; by W. -Rollins 382 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Ueber die physikalisch-chemischen Beziehungen zwischen 

 Aragonit und Calcit, H. W. Foote: Atomic Weight of Radio-active Barium, 

 M. and Mdme. Curie, 392. — Artificial Radio-active Barium, A. Debiebne: 

 Relative Values of the Mitscherlich and Hydrofluoric Acid Methods for the 

 determination of Ferrous Iron, Hillebrand and Stokes, 393. — Grundlinien der 

 anorganischen Chemie, W. Ostwald. 394.— Elements of Tnorganic Chemistry 

 for Use in Schools and Colleges, W. A. Shenstone: Kohlenoxydvergiftung, 

 W. Sachs: Hall Effect in Flames, E. Marx, 395. — Wireless Telegraphy, J. 

 Vallot and J. and L. Lecarme : Spectrum of Radium, C. Runge: Magnetic 

 effect of moving electrical charges, M. Cremieu : What electric pressure is 

 dangerous ? H. F. Weber, 396. 



Geology and Mineralogy — Recent Publications of the U.S. Geological Survey, 397. 

 — Department of Geology and Natural Resources of Indiana, 24th Annual 

 Report, 1899, W. S. Blatchlet, 398. — Geological Report on Monroe County, 

 Michigan, W. H. Sherzer and A. C. Lane : Elements of the Geology of Ten- 

 nessee, J. M. Safford and J. B. Killebrew: Geological Survey of Canada, 

 G. M. Dawson, 399. — Correlation between Tertiary Mammal Horizons of Europe 

 and America, H. F. Osborn, 400. — Flow of Marble under Pressure, F. D. 

 Adams and J. T. Nicolson, 401. — Report of the Section of Chemistry and 

 Mineralogy, G. C. Hoffmann: Florencite, a new mineral, Hussar and 

 Prior, 404. — Elements of Mineralogy, Crystallography and Blowpipe Analysis 

 from a practical Standpoint, A. J. Moses and C. L. Parsons, 405. 



Miscellaneous Scientific Intelligence — Latitude-variation, Earth-magnetism and 

 Solar activity, J. Halm. 405. — Location of the South Magnetic Pole, C. E. 

 Borchgrevink : Ostwald's Klassiker der Exakten Wissenschaften: Scientia, H. 

 Laurent and F. M. Raoult: Introduction to Science, A. Hill, 406. 



