In this work the author has given a brilliant clinical interpretation of the reactivation of tuberculosis in the adult. In places it is highly speculative. Nevertheless it is a fascinating work and convincing even where the issues may be bridged with scant evidence. It consists of a collection of lectures fitted together and given a general title. It contains the author's theories, representing well the French school, supplemented by serial roentgenograms. One cannot read this book without obtaining clearer views on the complex subject of reactivation.
The first chapter is a lecture devoted to the clinical evolution of the disease, and the second to the problem of reactivation. Each serves as an outline for the last three chapters, which elaborate interestingly on three phases of reactivation: the soil, the seed, and the routes of reactivation.
Perhaps the greatest worth of the volume is in reemphasizing the rôle of the host