First published in 1934, and then in a second edition in 1939, this book gives a full account of theoretical meteorology as it was understood at the time. Where theory failed to explain phenomena, the author limited himself to a description of the phenomena and an indication of such theory as was felt to be helpful. Little of the first edition was omitted, but additions were made to many chapters of the second edition, and the chapter on turbulence in the atmosphere was completely rewritten.