Here is truly an encyclopedic treatise on pulmonary and pleural tuberculosis. It has the rare merit of presenting an objective critical review of all the theories and hypotheses on the subject, unbiased by personal views. The subject is skilfully treated and the controversial theories are discussed. The author does not seem to be conversant with some of the work on the chemistry of tuberculosis and on the tuberculoproteins that is being developed in America through cooperative research. Ranke's doctrine on the clinical development of the disease and its division in the three stages is well presented with detailed discussion of the numerous objections that have been advanced against it. In chapter VIII the rôle of infections in the course of disease are carefully presented with the evidence tending to show that quite often the hypersensitive state prevails which renders the body hypersusceptible to the infection. The chapters on x-ray studies
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