Me. Turekian, Karl and Kulp, J. Laurence STROMTIUM CONTENT UF HUMAN SONES. Science ic, Marked regional differences in the Sr content of human bones were observed as a result of the analyses of 277 human bones from a world-wide sanpling. The % Sr/% Ca x 10° ratio was determined on bones ashed at 8000° for 12-24 hours. This ratio was not affected by bone type, age, or sex. Bones from Brazil and Liberia had high average ratios, Denmark, Italy and Japan, intermediate average ratios, and Colo ne, Switzerland, and Bonn low average ratios (1.33, 1.25, 0. 89, 0.71, 0.70, 0.36, 0.35, and 0. 35 respectively). Analyses of bones of 9 other regions were also reported. 75. U. S. Department of Agriculture RADIOACTIVE FALLOUT ON THE ARM. po.2107. Washington, , U. S. Government Printing Office, 1957. 6p. bento. 76. U.S. Federal Civil Defense Administration PALLOUT DEBRIS DEPOSITION. S000" U. S. Government Printing Office, 1957. 77. Warren, Shields ANTI-PERSONNEL EFFECTS OF NUCLEAR WEAPONS. Confluence &, no. 2, 131-8 (1956). 78. weiss, Herbert V. and Shipman, Ww. H. BIOLOGICAL CONCENTRATION BY KILLER CLAIS OF COBALT= 60 FROM RADIOACTIVE FALLOUT. Science 125, 695 (1957). In 2 specimer.s of Tridacna Gigas recovered frou the stores of Rongelap Island 2 years after the March, 1954, nuclear aetonation, readily detectable anounts Of both fe and y-radiztion were, presert. The activity was attributable ta Co ®Y (I) to the extent of 63 and 85% of the gross yeactivity. a conpornent of fission products, As it is vt it is assuned that it was ii.duged from an envircnnertal precursor possibly Co27, by the neutron flux accompanying the detor.ation. It was not detected in samples collecteed one year after the detonation; this points to an enormous cor.cer.treting capacity of Tridacna gigas.