1Although investigations along these lines have been going on for nearly 20 years, earlier papers are now chiefly of historical interest—see Austin, L. W.: Radio-Atmospheric Disturbances, Ann. Rept. Smith. Instn., 1926, pp. 203–208; and R. A. W. Watt: Abstracts of Papers on Meteorological Relations of Atmospherics, Q. J. Roy. Met. Soc., April, 1926, pp. 199–209.