This book, originally in French, appears as a revised and enlarged edition translated under the sponsorship of a group from the Rockefeller Institute and the New York Hospital-Cornell Medical Center. Drs. René Dubos and Walsh McDermott in their foreword, from which we quote, give the keynote of the book:
"With the discovery of the tubercle bacillus and of tuberculin allergy, it appears as if the high road had been reached toward a complete understanding of the genesis and course of the various types of tuberculous lesions. Unfortunately, the paths followed by the histopathologists and bacteriologists began to part shortly after these discoveries were made; the tissue changes in infection became the preoccupation of the first group of investigators, the characteristics of the etiologic agent the province of the other groups. As a result, the student of tuberculous disease is usually confronted with painstakingly detailed studies of either the tissue or