1. Rossby, C.-G., , , J. Marine Res., , v. 2, , p. 38 , 1939, .
2. Haurwitz, B., , , J. Marine Res., , v. 3, , p. 35 , 1940, .
3. Haurwitz, B., , , Beitr. Geophysik, , v. 51, , p. 195 , 1937, . [Equation (50) in which the influence of a has to be α considered.]
4. Allen, R. A., , , Quart. J. R. Met. Soc, , Spec, number, Toronto Meeting, 1939, (in press).