13 Acknowledgements Weare deeply grateful to many agencies and individuals for valuable assistance to the medical surveys since 1954. Manystaffs of the National Institute of Radiological Sciences, particularly Dr. K. Tsukamoto, Director, Dr S. Tanaka, Dr. S. Miwa, Dr. M.Seki, Dr. T. Yoneyama, Dr. E. Tazaki, Dr. Y. Mochizuki, Dr. S&. Oryu, Dr. N. Saeki, Mr. M. Uchi- yama, Mr. T. Iinuma, were most helpful in supporting the 1964 survey. Dr. M. Shimada, Dr. S. Ishii, Dr. I. Suzaki and other staffs of Yaizu City Hospital were also helpful in the medical survey. We express our gratitude to the Shizuoka prefectural and, the Yaizu municipal authorities and to the Fishermen’s Cooperative Union of Yaizu for their arrangement for smooth operation of the survey, Weare thankful to Dr, T. Iseki and Mrs. M. Sato for their excellent culture techniques, and also to Miss A. Yamane, Mrs. T. Kamagata, Mr. Miura and Mrs. Y. Nakajima for laboratory studies. We wish to thank Dr. C. L. Dunham, U.S. AECand Dr. R. A. Conard, Brookhaven National Laboratory, for arranging the visit of Dr. Kumatori to Marshall Islands. eed OB

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