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Notes:
CONTENTS.—RP387, Life of sagger as affected by varying certain properties; by R. A. Heindl and L. E. Mong.—RP388, Thermal expansion of heat-resisting alloys, nickel-chromium, iron-chromium, and nickel-chromium-iron alloys;, by Peter Hidnert.—RP389, Physical properties of cast stone; by John Tucker, jr., G. W. Walker, and J. Arthar Swenson.—RP390, Investigations of Kennelly-Heaviside layer heights for frequencies between 1,600 and 8,650 kilocycles per second; by T. R. Gilliland, G. W. Kenrick, and K. A. Norton.—RP391, Determination of insoluble matter in shellac; by C. C. Hartman.—RP392, Derivatives of 4-glucosido-mannose; by Horace S. Isbell.— RP393, Thermal expansion of gasolines from 0° to 30° C.; by C. S. Cragoe and E. E. Hill.—RP394. Tests of integral and surface waterprooflngs for concrete; by C. H. Jumper.—RP395, Effect of pH on photochemical decomposition of silk; by Milton Harris and Daniel A. Jessup.—Index to v. 7.
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* For Sale by Superintendent of Documents. Paper, 40c. (single copies vary in price), $2.75 a yr.; foreign subscription, $3.50.