Meteorological Influences upon "Sr Fallout Concentration in Precipitation: Part 2. Convective Activity and Extratropical Cyclones . . 982 Fission Products in the Atmosphere and in Rain 602 Characteristics of Relative Sr Concentrations in Surface Air. 616 Paui Kruger, Charles L. Hosler, and Albert Miller P. K. Kuroda, Pentti Kauranen, B. D. Paimer, K. K, Menon, and L. M. Fry Herbert L. Volchok Distribution of Radioactivity with Height in Nuclear Clouds . soe Gilbert J, Ferber . e . e e e Trends in the Global Distribution of Tritium Since 1961 L. L. Thatcher, B. R. Payne, and J. F. Cameron 629 646 Oxygen-18, Deuterium, and Tritium in Natural Waters and Their Relation to the Global Circulation of Water . 675 . Erik Eriksson and Bert Bolin | 687 Session IIIB Discussion. SeEoTE Distribution and Cycling of Radionuclides F, W, Lengemann, Chairman Cesium- 137 Passage from Precipitation to Milk Gerald M. Ward, James E. Johnson, and Harold F. Steuart 703 Fission-product Cycles in an Agricultural System. I. Sample Heterogeneity Howard A. Hawthorne . . . 411 Use of Surface-air Concentration and Rainfall Measurements to Predict Deposition of Fallout Radionuclides . 723 Radiation to Bone from *Sr in New York City Residents . ... . 737 Cesium-137 and Strontium-90 Retention Following an Acute Ingestion of Rongelap Food 743 Charles A. Pelletier, G. Hoyt Whipple, and Harold L. Wedlick Joseph Rivera Edward P. Hardy, Jr., Joseph Rivera, and Robert A. Conard Early Food-chain Kinetics of Radionuclides Following Close-in Fallout from a Single 758 Nuclear Detonation William E. Martin Fission-product Deposition and Dietary Levels inthe Chicago Area. . . : P, F. Gustafson, S. S. Brar, and S. E. Muniak . 783