A REFERENCE to the treatment of catarrhal deafness and head noises by x-rays occurs as early as 1904 in a paper by Joseph Beck (1), of Chicago. The patient was a woman of 51 who, after four months of conservative treatment for what her physician diagnosed as a chronic catarrhal condition of the middle ear, was submitted to an ossiculectomy. Only partial relief of the ear noises followed. She was then given x-ray treatment to the ears for about three weeks without the slightest relief, whereupon radium was applied directly to the tympanic cavity every day for about six weeks with equally poor results. No mention was made of the x-ray factors. In 1906 Dionisio (2) reported 20 cases treated by x-rays, the patients suffering from chronic suppurative inflammation of the middle ear. Sixteen of these cases were cured, he states. The hearing of many of them also improved. From that time on many papers appeared in the literature describing the effect produced by x-rays or radium on impaired hearing and tinnitus. Desjardins (3) reviewed critically some fifty which appeared up to 1930 and concluded that irradiation may influence tinnitus especially and sometimes also exert a favorable action on hearing. The crudity with which some of the treatments was often conducted must, he believed, undoubtedly account for a certain proportion of the failures. The cases here recorded were all examined by a single otologist and the diagnoses made of chronic catarrhal or secretory deafness. No case of chronic suppurative middle ear disease or otosclerosis was treated knowingly. Each case was referred only after all the customary otological-therapeutic procedures had been practised without avail. Each patient had the commonly accepted hearing tests of whispered and spoken voice, tuning forks, and a modified Rinne before and after the x-ray treatment series. The same x-ray formula was used in the entire series and the physical set-up was checked at frequent intervals to keep the radiation identical as far as could be. From 1929 to 1935, inclusive, 140 patients were treated. Of this group, 73 were improved as to hearing and tinnitus; 65 were unchanged, and two were made worse. In the unchanged group are included 14 cases on which there was no adequate follow-up. Of the improved group, 67 had nine treatments to each ear and six received only eight treatments. Since all of these patients showed improvement and only four cases of the total group who received less than nine treatments showed improvement, I have designated nine treatments as the acceptable course or cycle. There were 20 patients of the 51 followed and classified as unimproved who had nine treatments each. The remainder had as few as two treatments and none more than six. There were 20 cases of the 140 who had tinnitus.