“…This type of treatment has been the subject of many papers, though radon has been largely supplanted by gold (AuLQ8) (Talairach andTournoux, 1955, 1958;Greening, 1956Greening, , 1957Talairach, Aboulber, Tournoux, and David, 1956;Ellis and others, 1958;Gros and others, 1960) and Y g o (Ferguson, 1957;Forrest andothers, 1958, 1959;Evans, Fenge, Kelly, and Harper, 1959;Frazer and others, 1959;Greening and others, 1960;Gros, Gary-Bobo, and Belotte, 1960;Gros, Roilgen, and Vlahovitch, 1960;Juret and Hayem, 1961;Newel1 and Ironside, 1960). A variation is implantation by the paranasal transethmoidal route (Bauer, 1956a, b ;Escher and others, 1958a, b;Ruckes, 1960;Klar, 1960;Bogasch, Kasbauer, and Ihnlen, 1961 ;Escher and Ludi, 1961).…”