the boundary-layer differential equations. Included are the effects of suction and injection as well as heat and mass transfer and compressible boundary layers. The treatment of turbulent boundary layers is preceeded by a discussion of transition including a short outline of stability theory and presentation of experimental information. In turbulent flow, considerable space is provided for the modeling of the turbulent transport process, including time mean flow formulations (models of the inner and outer region), models based on turbulent kinetic energy, on energy and length scale (k-e models), and on Reynolds stress. Chapters are devoted to turbulent-free shear layers, boundary layers with variable density, and heat and mass transfer. The book presents a well-rounded and up-to-date introduction to our present knowledge of boundary-layer flow and its analysis. The author offers the book as text for upper division undergraduate and first-year graduate courses for mechanical, chemical, aeronautical, civil, and ocean engineering students. This reviewer suspects that the treatment, especially of the turbulent modeling, is too short for students to perform computer analysis of turbulent boundary layers without supporting material. Some detailed remarks: With the many parameters appearing in the text, it would be helpful to include their definitions in the section NOTATION or to refer to the pages where they are introduced. Notations in figures are sometimes not defined (e.g., in Figs. 6-11 and 7-38). The notations in Figs. 1-8, C and D, are identical—what is the difference? Such shortcomings should be removed in a second edition. In summary, the book is an excellent introduction to boundary-layer theory for those wanting information about our present knowledge of boundary-layer flow and our ability to predict its character. It can also be recommended as a textbook when additional supporting material is provided. E. R. G. Eckert University of Minnesota