tration with selective elution of ¥® is described. Low-level techniques are employed to count the Y*° which reflects the concentration of Sr®. Twenty-six liters of city tap water were concentrated and found to contain 3.10 + 0.21 x 107¢ dpm/ml of Sr®’. if interferring activities are present, the sr* can be eluted and radiochemical separation performed. 70. Sugiura, ¥. and Kanazawa, T. RADIOACTIVE FALLOUT COLLECTED IN TOKYO ON NOVEMBER26, 1955. Papers in Meteorology and Geophysics, Tokyo 7, 128-35 (1956). A large nuclear weapon test by Russia was reported November 23, 1955 as having oc- curred the previous day. Rain water and fallout samples taken in Tokyo produced a secondary fallout from some previous explosion. Rain water of the 21st and fallout of the 29th had radioactive content of 13 days half-life; fallout of the 26th, rain of the 27th 3 days half-life. Sample of the 26th consisted of 15 mg of sooty material giving nearly 2000 counts/min at that time. 71. Tajima, Eizo and Doke, Tadayoshi. (Tokyo) (Science) 26, 124-9 (1956). RADIOACTIVE DUST IN THE OPEN AIR. Kagaku A review of radioactive dust. 72. Tanidazawa, M. and Ishihara, T. RADIOACTIVE ELEMENTS FOUND IN PLANTS CONTAMINATED BY RADIOACTIVE RAIN. Radioisotopes (Japan) 3, No. 1, 21-2 (1954). Ashes obtained from contaminated trifolium repens, astragalus sinicus, and rumex japonicus were studied. The precipitate obtained by treating the acidic solution of the ash with H,S followed by Fe*? in the presence of NH, and NH,Cl contained Y, Sr, and the rare earth elements. 73. Thomas, Harold Allen. THE PUBLIC HEALTH IMPLICATIONS OF RADIOACTIVE FALLOUT IN WATER SUPPLIES. American Journal of Public Health and the Nation’s Health 46, 1266-74 (1956). Significant increases in radioactivity in Massachusetts streams occurred only when precipitation took place through radioactive air masses. During the period from November 1951 to June 1953, there were 24 detonations, only five were followed by fallout extensive enough to raise the radioactivity above natural levels. The maximum observed in any sample was about 3 x 10~' microcuries per milliliter of total beta activity at three days after fission. 74, Turekian, Karl and Kulp, J. Laurence. Science 124, 405-7 (1956). STRONTIUM CONTENT OF HUMAN BONES. 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 sampling. The % Sr/% Ca x 103 ratio was determined on bones ashed at 800° 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 Cologne, 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. Bulletin No. 2107. RADIOACTIVE FALLOUT ON THE FARM. Farmer’s Washington, U. 8. Government Printing Office, 1957. 16p. $0.10. 76. U. S. Federal Civil Defense Administration. FALLOUT DEBRIS DEPOSITION. 11-31. Washington, U. S. Government Printing Office, (1957). $0.25. 77. FCD 1.3: Warren, Shields. ANTI-PERSONNEL EFFECTS OF NUCLEAR WEAPONS. Confluence 5, No. 2, 131-8 (1956). 78. Weiss, Herbert V. and Shipman, W. H. BIOLOGICAL CONCENTRATION BY KILLER CLAMS OF COBALT-60 FROM RADIOACTIVE FALLOUT. Science 125, 695 (1957). In 2 specimens of Tridacna Gigas recovered from the shores of Rongelap Island 2 years after the March 1954 nuclear detonation, readily detectable amounts of both beta- and gamma-radiation were present. The activity was attributable to Co (I) to the extent of 63 and 85% of the gross gamma-activity. As it is not a component of fission products, it is assumed that it was induced from an environmental precursor possibly Co**, by the 165 woe ete