The Societé belge d'études scientifiques sur la tuberculose took up recently the subject of the pathology and treatment of bronchiectasis. Drs. Derscheid and Toussaint attempted a classification of these disorders. To class 1 they assign acute bronchiectasis, involving often a whole lobe, more commonly the left inferior lobe. In addition to medical treatment, including the thirst treatment, the postural treatment, the use of spirillicides, emetine, methenamine, colloidal metals, colloidal sulphur, balsamics and injections of alcohol, they recommend early bronchoscotherapy, artificial pneumothorax and surgical methods of exeresis. Class 2 includes chronic infected bronchiectasis with infectious paroxysms, amenable to active bronchoscopic cleansing with antiseptics to reduce the bronchorrhea; then phrenectomy or pneumothorax, combined, during the first months, with instillations by means of a sound at increasingly prolonged intervals, and possibly exeresis. Class 3 comprises noninfected dry bronchiectasis, in which, aside from a possible specific therapeusis, the treatment is to prevent infection.