CONTENTS. 



Page 



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



Yale Museum.; by L. F. Ward. (With Plates II-LV). 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. Spurr... 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-chetnischen Beziehungen zwischen 

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

 M. and Mdme. Curie, 392. — Artificial Badio-active Barium, A. Debierne: 

 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 Inorganic Chemistry 

 for Use in Schocris 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. Blatchley, 398. — Geological Report on Monroe County, 

 Michigan, W. H. Shebzer 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, Htjssak 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. 

 Borchgrevlnk : Ostwald's Klassiker der Exakten Wissenschaf ten : Scientia, H. 

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



TEN-VOLUME INDEX. 



An extra number, containing a 'full Index to volumes I to X of the Fourth 

 Series, will be ready in December. Sent only to those who specially order it. 

 Price one dollar. 



