Two effects produced by the x-rays, namely, the checking of pus formation and the atrophy produced in the follicles, suggested its use in the treatment of acne. The results obtained have been sufficiently gratifying, in my opinion, to justify the report of the following cases:
Case 1.
—Miss E. R., aged 20, had been under constitutional and local treatment for three months, without any appreciable improvement in the local condition. Early in January, 1902, the x-ray exposures were begun. She was given three exposures weekly of ten minutes each, with the tube 15 to 20 cm. distant. After two weeks there was manifest improvement and the exposures were reduced to two sittings weekly; by the end of February no active lesions or comedones could be detected, and the exposures were further reduced to once weekly until the end of March when all treatment was discontinued, and from that