Some Books Received

This monograph is the second of the series on the general subject of Aerodynamic Theory which is being prepared by recognised authorities under a grant from the Guggenheim Fund for the Promotion of Aeronautics, the first volume of which was reviewed in AIRCRAFT ENGINEERING, Vol. VI, September, 1934, p. 249. The preparation of the present volume is the joint work of Dr. Th. von Kármán, Director of the Guggenheim Aeronautics Laboratory, California Institute of Technology, Pasadena, and Dr. J. M. Burgers, Professor of Aero‐ and Hydrodynamics at the Technische Hoogeschool, Delft.