- 2 - radiation readings have been taken, samples collected, and changes recorded. The results of the expeditions sponsored by the U.S. Atomic Energy Commission Division of Biology and Medicine and carried out by the Applied Fisheries Laboratory, University of Washington, between March 26, 1954 and June 30, 1955 are summarized in UWFL-42 °. The results of the jointly-sponsored expedition of the AEC and the U.S. Naval Radiological Defense Laboratory during January 1955 are summarized in USNRDL-454 °. The need for further studies to bring the evaluations up to date was expressed by the AEC Division of Biology and Medicine in a communication from Dr. Charles L. Dunham, Director, on September 19, 1955. Acting on this request from Dr. Dunham,a field party from the Applied Fisheries Laboratory composed of Allyn H. Seymour, Edward E. Held, Kelshaw Bonham, and Frank G. Lowman left Seattle on October 12, 1955 and returned November 13, 1955. Collections of material for radiological contamina- tion evaluation and survey meter readings of residual contamination were obt ained by the field party on their visits of October 21-23 and November 7, 1955 to Rongelap and Ailinginae Atolls. The fine support and cooperation from all the organizations concerned made it possible to conduct this program with the maximum of efficiency. We are especially grateful for the support received from the Division of Biology and Medicine, the Eniwetok Field Office, Holmes and Narver, the U.S. Naval Station, Kwajalein, and the units of the Department of Defense stationed at Eniwetok.