-~ 45 Japanese scientists. The Russian ship "Vityaz" entered the area in 1958 during its 27th voyage (Kreps 1959) but radiological information ahout the voyage is not known at this time. Following the Castle test series of March 1 ta May 14, 1954 at Bikini-Eniwetok and during which time the Japanese fishing vessel, "Lucky Dragon," was caught in fallout of March 1, a survey was made in the Bikini area during the month of June by the Japanese vessel, "Shunkotsu Maru." Miyake et al (1956) reported that fallout was present in samples collected about 1,200 miles west of Bikini nearly four months after March 1, of about 10 miles per day. a rate of advance A second measurement of radio- activity in the ocean from the same test series was made by United States' (Harley 1956). scientists in March and April, About 400 days after March 1, 1955 1955, fall- out was detected in water samples from off the south coast of Japan, a distance estimated to be 3,300 miles from Bikini, a rate of advance of about 8 miles per day. Estimates made of the westward movement of radioactive waters from the area of Bikini-Eniwetok after the 1956 and 1958 test series, for periods of 43 days and 21 days res-