former Director, and the present Director Dr. Associate Director, and to doctors Kato, LeRov Allen, Steer, Belsky, Dr. Maki, and Wada. Also in Hiroshima the Committee wishes to thank Dr. Fumio Shigeto, “izuno, Director of the Hiroshima Atomic Bomb Hospital, Dr. Yutaka Countermeasure Section Chief at the Hiroshima Survivors Wel- fare Center, Mr. Hiroshi Suzuki, Vice Director of the Hiroshima A-bomh Aid Home, Mr. Kazuharu Hamasaki, Director Of the Hiroshima Peace Memorial Museum, and Dr. Tomin Harada, Director of the Harada Hospital. Qur special thanks is also herehy recorded for Dr. Haruo Ezaki, now Professor in the Second Surgery Department of the Hiroshima University School of Medicine, for nis participation as a consultant to the Committee. supervisor, Dr. We are especially grateful to Dr. Naomasa Okamoto, Fzaki's former Director of the Research Institute for Nuclear Medicine and Biology of Iiroshima for allowing Dr, Ezaki to take leave from the Institute to work with the Committec, Nagasaki. The Committee would like to extend its qratitude to the tionorable Yoshitake Murotani, Mavor of Nagasaki Citv and to his Deputy Mayor Soichi Urabe for his kindness to the Committee, and for the assistance in arranging the Committee's schedule. qrateful to Dr. We are also Sadahisa Kawamoto of the Nepartment of Medicine, Atomic Bomb Casualty Commission, Dr. Yoshimasa Matsuzaka, Assista nt Director of the Nagasaki Survivors Welfare Center, of the Nagasaki A-bomb Hospital, the Old Age A-borb Survivors liome , 180 a 5010448 to the cirectors