CONTENTS. Vll 



NumlDer 83. 



Page 

 Art. XXXIII. — Observations on the Eruptions of 1902 of 

 La Soufriere, St. Vincent, and Mt. Pelee, Martinique ; 

 byE. O. HovEY. (With Plate VIII)... 319 



XXXIV.— Reflection of Electric Waves at the Free End of 



a Parallel Wire System ; by H. A. Bumstead... 359 



XXXV. — Upper Permian in Western Texas; by G. H. 



GlRTY _ _ ._ 363 



XXXVI. — Reduction of Vanadic Acid by the Action of 



Hydrochloric Acid ; by F. A. Gooch and L. B. Stookey 369 



John Wesley Powell __ 377 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Combination of Hydrogen and Oxygen, Baker : 

 Arsenic in the Animal Organism, Bertrand, 383. — Atomic Weight of 

 Eadium, Curie : Double and Triple Thiocyanites, Wells, 384, — Deter- 

 mination of Thallium in the Thallous State, Thomas : Chemisches 

 Praktikum, A. Wolfrum : Vacuum Thermo Element, P. Lebedew : Elec- 

 tromotive Force of Ozone, A. Brand, 385,— Influence of Electrification of 

 the Air on Electric Sparks, E. Lecher : Eeaction between Electrostatic 

 Tubes and Insulators, M. W. de Nicolaieve : Magnetic Detector for elec- 

 trical waves, Marconi : Eadiations from Eadioactive Substances, Euther- 

 FORD and Brooks, 386. — Induced Eadioactivity in Air, J. J. Thomson : 

 Deviable Eays of Eadioactive Substances, Eutherford and Grier : 

 Eemovai of Negative Electricity from the air by falling drops of water, A. 

 Schmauss : Elements of Experimental Phonetics, E. W. Scripture, 387. 



Geology and Mineralogy — United States Geological Survey, 389.— Iowa 

 Geological Survey, S. Calvin, 391. — Evolution of the northern part of the 

 Lowlands of Southeastern Missouri, C. F. Marbut : Geology of the 

 Potomac Group of the Middle Atlantic Slope, W. B. Clark and A. 

 Bibbins, 392. — Pleistocene Geology of Western New York, H. L. Fair- 

 child : Michigan Geological Survey, A, C. Lane : Vertebrates of the 

 Mid-Cretaceous of the Northwest Territory, H. F. Osborn and L. M, 

 Lambe : Queneau on Size of Grain in Igneous Eocks, A. C. Lane, 393. — Les 

 Eoches alcalines caracterisant la Province petrographique k' Ampasindava, 

 A. Lacroix : Ueber mariupolit, ein extremes Glied der Elaeolithsyenite, 

 J. MoROZEWicz, 396. — Dahamit, ein neues Ganggestein aus der Gefolg- 

 schaft des Alkaligranit, A. Pelikan : Mineral Eesources of South Dakota, 

 C. C. O'Harra and J. E. Todd : Occurrence of Native Arsenic, N. N. 

 Evans : Inverness Earthquake of September 18th, 1901, and the Carlisle 

 Earthquake of July, 1901, C. Davison, 397. 



Miscellaneous Scientific Intelligence — Beitrage zur chemischen Physiologie 

 und Pathologic, F. Hofmeister : Les Dirigibles, M. H. Andr6 : Introduc- 

 tion to Physical Geography, G. K. Gilbert and A. P. Brigham, 398. 



