NATIONAL INSTITUTE OF RADIOLOGICAL SCIENCES 9-1, 4-chome, Anagawa, Chiba-shi, Japan syndrome was not apparent. However, Dr. M. S. Sasaki, Dept. of Human Cytogenetics, Tokyo Medical and Dental University, has found a difference between the 175-rad group and the 70-rad group of the exposed Marshallese (Radiation Biology Research Communication 3: 3-21, 1968, in Japanese) from the data of Lisco and Conard (Science 157: 445-447, 1967) using the method with which the estimate for atomic bomb survivors was made 22 years after exposure (Nature 220: 1189-1193, 1968). Taking above mentioned facts into consideration, I would like to suggest that cytogenetical examination be done on the selected cases in near future, This study is considered to be important to detect the late effects. 3. Since Iam not a specialist in the field of radiation dosimetry, I asked an authority of our Institute. According to his opinion, the ways of estimation described in BNL report are reasonable. In addition to these comments, I would like to make a proposal that Trust Territory Government request the United Nations to have an international scientific meeting on the effects of radiation-exposed people including the Marshallese. I believe that such a meeting is useful to dispel several misunderstandings. 217 IGt4B2b