Vlll CONTENTS. 



Xuniber 246. 



Page 



Art. L1II. — The Study of the Earth's Figure by means of 



the Pendulum; by E. D. Preston 445 



LIY. — Post-Glacial History of the Hudson River Valley ; 



byF. J. H. Merrill 460 



LV. — Alunite and Diaspore from the Rosita Hills, Colorado ; 



by Whitman Cross . 466 



JjSTL — Diaspore Crystals; by W. H. Melville 475 



LVIL — Combustion of Gas Jets under Pressure; by R. W. 



Wood, Jr 477 



LVIII. — Allotropic Silver; by M. Carey Lea 482 



LIX. — Notes on the sub-marine channel of the Hudson River 



and other evidences of Post-glacial Subsidence of the 



Middle Atlantic Coast Region; by A. Lindenkohl. 



(With Plate XVIII).... 489 



LX. — Are there Glacial Records in the Xewark System ? by 



I. C. Russell 499 



LXI. — A reply to Professor Nipher on " The Theory of the 



Solar Corona"; byF. H. Bigelow 505 



LX1I. — Recent Eruption of Kilauea ; by W. T. Brigham .. 507 

 LXIII. — Turquois in Southwestern New Mexico ; by C. H. 



Snow 511 



SCIENTIFIC INTELLIGENCE. 



Chemistry and. Physics — Compressibility of Hydrogen. Oxygen and Nitrogen, 

 Amagat: Osmotic Pressure, Boltzmann, 512. — Production of Electrification 

 in the Preparation of solid Carbon dioxide, Haussknecht. 513. — Molecular 

 Formula of Hydrogen Fluoride, Paterxo and Peratoxer: Extraction of 

 Oxygen from the Air, Kassxer, 514. — Sodium-amine and Di-sod-ammonium 

 chloride, Joaxxis: Velocity of electrical waves in insulating fluids, Aroxs and 

 Reubens: The telephone in an optical apparatus for measurement of electrical 

 currents, Max Wein: Photography of the ultra red rays. G-. Higgs, 515. — 

 Lecture experiment on magnetic screening of conducting media, J. J. Borgman. 

 516. 



Geology and Natural History — Eruption of Kilauea : Geological Survey of Ohio : 

 Iron Ores of Minnesota, N. H. Wixchell and H. Y. Wixchell. 516. — 

 Tertiary Insects of North America, S. H. Scudder: Trilobites of the Upper 

 Carboniferous of Kansas : An Introduction to the study of Petrology. F. H. 

 Hatch, 517. — Sinopsis Mineralogica 6 Catalogo descriptivo delos Minerales por 

 C. F. de Laxdero : New Meteorites : Die Protoplasmaverbindungen zwischen 

 benachbarten Gewebeselementen in der Pflanze, by F. Kiexitz-Gerloff, 518. 

 — Protoplasmaverbindungen bei Algen, F. G. Kohl, 520. 



Miscellaneous Scientific Intelligence — The Journal of Comparative Neurology, 520. 

 — A Journal of American Ethnology and Archaeology, Editor, J. W. Fewkes : 

 Helmholtz Celebration and Medal: National Academy of Sciences, 521. — 

 Magnetite Ore Districts of Brazil, 522. 



Obituary — Joseph Leeqy, 523 ; Johx LeCoxte, 525 ; Julius Erasmus Hilgard, 

 526. 



Index to Volume XLI, 527. 



