CONTENTS. Vll 



Number 239. 



Page 



Art. XLIV.— Further Study of the Solar Corona ; by F. H. 



Bigelow 343 



XLV. — Superimposition of the Drainage in Central Texas ; 



by R S. Tarr 359 



XL VI. — Description of the " Bernardston Series" of Meta- 



morphic Upper Devonian Rocks ; by B. K. Emerson. _ 362 



XL VII. — Analysis of Rhodochrosite from Franklin Furnace, 



New Jersey ; by P. E. Browning 375 



XL VIII. — Re-determination of the Atomic Weight of Cad- 

 mium ; by E. A. Partridge 311 



XLIX. — Occurrence of Nitrogen in Uraninite and compo- 

 sition of Uraninite in general ; by W. F. Hiixebrand _ 384 



L. — Anthophyllite from Franklin, Macon Co., N. C. ; by 



S. L. Penpield 394 



LI. — Preglacial Drainage and Recent Geological History of 



Western Pennsylvania ; by P. M. Foshay 397 



LII. — So-called Perofskite from Magnet Cove, Arkansas ; by 



F. W. Mar _ 403 



LILT. — Experiments upon the Constitution of the Natural 



Silicates; by F. W. Clarke and E. A. Schneider 405 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — Improved Vapor-density Method, Schall, 415. — Im- 

 proved form of Grove's Gas Battery, Mond and Langer : Formation of 

 Hydrogen Peroxide from Ether, Dunstan and Dymond, 417. — Action of Car- 

 bon monoxide upon Metallic Nickel, Mond, Langer, and F. Quincke, 418. — 

 "Waves in air produced by Projectiles, Mach and Wentzel: E. Mach and P. 

 Salcher : E. Mach and L. Mach : Re-de termination of the Ohm, J. Y. Jones, 

 419. — Alternating versus continuous currents in relation to the Human body, 

 H. N. Lawrence and A. Harries, 420. 



Geology and Natural History.' — Phylogeny of the Pelecypoda, the Aviculida? and 

 their allies, R. T. Jackson, 421. — Revue des travaux de paleontologie vegetale, 

 parus en 1888 ou dans le cours des annees precedentes, G. de Saporta : Notes 

 on the Leaves of Liriodendron, T. Holm, 422. — Contributions to the Tertiary 

 Fauna of Florida, W. H. Dall : Syrin.othyris Winchell, and its American 

 Species, C. Schuchert: Mineral Resources of the United States, D. T. Day, 

 423. — Elements of Crystallography for students of Chemistry, Physics and 

 Mineralogy, Geo. H. Williams : Rumpfite, a new mineral, G. Firtsch : 

 Polybasite from Colorado, F. M. Endlich, 424. 



