The special training division of the Oak Ridge Institute of Nuclear Studies has announced that three additional courses in the techniques of using radioisotopes in research have been scheduled during the winter and spring of 1951. They are to be held from January 8th to February 2nd, from February 19th to March 16th, and from April 16th to May 11th. Designed to acquaint research workers with the safe and efficient use of radioisotopes, the courses include laboratory work, lectures, and special‐topic seminars. Experiments cover such matters as the use and calibration of instruments, purification and separation of radioactive materials from inert and other radioactive materials, and pile activation technology. The seminars cover various biological and medical uses of radioisotopes and the design of radiochemical laboratories.