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ABSTRACT _American Journal of Science_, June.—Physical structure and hypsometry of the Catskill Mountain region, by A. Guyot.— Recent explorations in the Wappinger Valley limestone of

Dutchess Co., N.Y., by W. B. Dwight.—The colour-correction of certain achromatic object-glasses, by C. A. Young.—Note on the companion of Sirius, by A. Hall.—Study of the Emmet Co. meteorite

that fell near Estherville, May 10, 1879, by J. Lawrence Smith.—Oxidation of hydrochloric acid solutions of antimony in the atmosphere, by J. P. Cooke.—Relation between the colours and

magnitudes of the components of binary stars, by E. S. Holden.—Occurrence of true lingula in the Trenton limestones, by R. P. Whitfield.—Experiments on Mr. Edison's dynamometer,

dynamo-machine, and lamp, by Profs. Brackett and Young.—On substances possessing the power of developing the latent photographic image, by M. Carey Lea. Access through your institution Buy

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and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE _Scientific Serials_ . _Nature_ 22, 257–258 (1880). https://doi.org/10.1038/022257b0 Download citation * Issue Date: 15 July 1880 * DOI:

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