CONTENTS. Vll 



Number 113. 



Page 

 Art. XXXIY. — Physiographic Improbability of Land at 



the North Pole ; by J. W. Spencer 333 



XXXV. — Bibliography of Submarine Valleys off North 



America ; by J. W. Spencer 341 



XXXVI. — Interesting Variety of Fetid Calcite and the Cause 



of its Odor ; by B. J. Harrington 345 



XXXVII. — Alternations of Large and Small Coronas 

 observed in Case of Identical Condensations produced 

 in Dust-free Air saturated with Moisture ; by C. Barus 349 



XXXVIIL— New Circular Projection of the Whole Earth's 



Surface ; by A. J. van dee Grinten 357 



XXXIX. — Progress of the Albatross Expedition to the 



Eastern Pacific ; by A. Agassiz 367 



XL. — Note on the Names Amphion, Harpina, and Platyme- 



topus; by P. E. Raymond 377 



XLI. — Bragdon Formation ; by J. S. Diller 379 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics— Preparation and Properties of Tantalum, W. von 

 Bolton : Gravimetric Determination of Nitric Acid, M. Busch, 388. — 

 Unity of Thorium, E. J. Meyer and A. Gumperz, 389. — Nitroxyl Chloride, 

 Gutbier and Lohmann ; Heusler Magnetic Alloys, E. Gumlich : High 

 Frequency Alternator, W. Duddell, 390. — Deviation during Free Fall, 

 De Sparre : Polarized Bontgen Eadiation, C. G. Barkla, 391. 



Geology and Mineralogy — Plans for Obtaining Subterranean Temperatures, 

 G. K. Gilbert, 393. — Vermont Geological Survey: Big " Cullman " Dia- 

 mond from the Transvaal, F. H. Hatch and G. S. Corstorphine, 395. — 

 Moissanite, a Natural Silicon Carbide, G. F. Kunz. 396. — Occurrence of 

 Palladium and Platinum in Brazil, E. Hussak, 397. — Platinum Eesources 

 in the United States, 398. — Beitrage zur Mineralogie von Japan, T. Wada, 

 399. 



Miscellaneous Scientific Intelligence — National Academy of Sciences, 399. — 

 Astronomical Observatory of Harvard College : Journal of Agricultural 

 Science, 400. 



