CONTENTS 



Page 



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



the Pendulum ; by E. D. Preston _. 445 



LIV. — 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 



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



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



Wood, Jr..... 477 



LVIIL— 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 Newark 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, Paterno and Peratoner: Extraction of 

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

 chloride, Joannis : Telocity of electrical waves in insulating fluids, Arons 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. Winchell and H. V. Winchell, 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 d Catalogo descriptivo de los Minerales por 

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

 benachbarten Gewebeselementen in der Pflanze, by F. Kienitz-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 Leidy, 523; John LeConte, 525; Julius Erasmus Hilgard, 

 526. 

 Index to Volume XLI, 527. 



