Dr. Edward J. Stieglitz, Garrett Park, Md., has been appointed research associate in gerontology at the National Institute of Health to organize a new unit of research to deal with problems of aging.Capt. Robert E. Hoyt has succeeded Capt. Edgar L. Woods as commander of the Naval Hospital, Washington, D. C. Captain Hoyt was formerly medical officer in charge of the Naval Dispensary at Washington.Dr. Hermon E. Hasseltine, Medical Director in the U. S. Public Health Service, has been transferred from the National Leprosarium at Carville, La., to Cincinnati as officer in charge of the stream pollution laboratory. Dr. Guy H. Faget, recently stationed in San Francisco, replaced Dr. Hasseltine as medical officer in charge at the Leprosarium.