This volume, in Russian, contains a series of roentgenologic studies, animal experiments and clinical observations aiming to elucidate the incidence and the rôle of bronchial obstruction in the pathogenesis of various diseases of the lungs, but particularly in pulmonary tuberculosis. Bronchography in the living patient, postmortem bronchography, and bronchoscopy will, in the opinion of the authors, broaden our knowledge of the morphology and physiology of the bronchial tree and of the tuberculous process. The authors concede the priority of the concept of bronchial obstruction as a factor in the pathogenesis of pulmonary diseases to American workers (Jackson, Coryllos and Birnbaum). It appears from their observations that bronchial obstruction is a frequent if not constant phenomenon in atelectasis and emphysema. They were not, however, able to support Coryllos's theory of pneumonia, since in their studies the bronchi were never found to be occluded in that condition.