Tridione (3,5,5,-trimethyloxazolidine-2 4dione) has been extensively used in the treatment of petit mal for five years, and its success in more than 60% of cases has been well established. Its dangers and limitations are also well recognized (Richards and Everett, 1944; Lennox, 1947). During the past two years 25 men between the ages of 17 and 52 who suffered from frequent petit mal, and 15 of ...