SPECIAL ARTICLES.—On question of day-to-day fluctuations in derived values of solar constant; by C. F. Marvin.—Smithsonian solar-constant values; by Herbert H. Kimball.—Probable 24-hour temperature change (7 a. m. to 7 a. m.) at Montgomery, Ala.; by Jesse W. Smith and Welby R. Stevens.—Two waterspouts in Mobile Bay, June 12, 1925; by Albert Ashenberger.—Cirro-cumuli and thunderstorms; by R. M. Dole.—Are present methods of rainfall insurance sound? by Cyrus H. Eshleman.—On application to meteorology of astronomical cycle of 744 years, by M. Gabriel; translation by R. M. Varney.