For both its successful treatment and the complete prevention of spread of infection, phthisis must be recognised at an early stage. The Public Health Department of Brighton is the focus of all the measures, prophylactic, curative, and sanitary, which are taken in the treatment and the prevention of this disease. In persons of tuberculous family history periodical weighing is one of the best means of ensuring the early recognition and treatment of disease. Of means for the early detection of tuberculosis, other than physical examinations and the testing of the sputum, the use of tuberculin is the best known. A local method of using tuberculin as a means of diagnosis has been described recently by Calmette, which may prove to be valuable. The Roentgen ray photograph of a chest in which there is an early tuberculous focus sometimes shows a shadow at the affected part.