“…Experience during the past six years has shown potassium perchlorate to be as effective an antithyroid agent as the more commonly used organic drugs methylthiouracil and carbimazole (Morgans and Trotter, 1954;Godley and Stanbury, 1954;Smellie, 1957;Fairhurst and Hollingworth, 1958;Crooks and Wayne, 1959;Cook and Hawe, 1960;Brit. med.…”