American yournal of Science, May.—Action of frost on the arrangement of superficial earthy material, by W. C. Kerr.—Dall's observations on Arctic ice and the bearing of the facts on glacial phenomena in Minnesota, by N. H. Winchell.—Projection of lines of equal pressure in the United States, west of the Mississippi, by H. A. Hagen.—Neumann's method of calibrating thermometers, with ways of getting columns for calibration, by T. Russell.—William Hallowes Miller, by J. P. Cooke.—Geology of Peace River region, by G. M. Dawson.—Shadows obtained during the glow-discharge, by H. B. Fine and W. F. Magie.—New form of galvanometer for powerful currents, by C. F. Braclsett.—American Jurassic dinosaurs, by O. C. Marsh.