The use of sunlight in the treatment of chronic diseases is as old as the study of medicine. The specific action of heliotherapy on deep seated tuberculous lesions was first emphasized by the Lyons school of surgeons in France. Their treatment consisted for the most part in exposure of the diseased area alone, although a few of the teachers recommended general, as well as local heliotherapy. In 1903, Rollier opened, in Leysin, Switzerland, the first clinic for the systematic application of the sun bath to the entire surface of the body, in the treatment of extrapulmonary tuberculosis. During the last fifteen years, heliotherapy has spread rapidly, and in our own country, a number of clinics are employing a more or less modified form of this treatment.
The use of the sun bath as a therapeutic agent in the treatment of extrapulmonary tuberculosis is based on the recognition of the fact