-~- 28 - total activity) and in the liver (15,000 d/m/g dry weight, 16 per cent of total activity) (Tables 2 and 3). present in the kidney, red muscle, It was not or white muscle. This specimen is the only one in which wi85 was detected with certainty within tissues of an organism. In general, the levels of wi85 in samples from the islands of Eniwetok Atoll reflected the pattern of distribution found at the plankton stations. Thus, the island (Belle) northwest of the target area (near Janet Island) had very high levels of wiSd | The islands south (Vera) and southwest (Henry, Keith, and Leroy) of the target area had lower levels of the isotope. Ujelang Atoll The wi85 contamination on the plant leaves and in the soil at Ujelang Atoll, collected July 19, 1958, was low in comparison with that at Eniwetok, and Keith Islands, with the exception of Leroy where low levels of wi8s5 were observed also. The ratio of wi85 to the other gamma-emitting isotopes in the Ujelang plant samples, at Eniwetok. however, was similar to the ratios found Thus in Scaevola and Messerschmidia leaves at Belle Island (Eniwetok Atoll) for which the disintegration rates were corrected to July 19, wis contributed 66 per cent