A filter paper method of collecting atmospheric radioactivity is described. The mean radon concentration found by this method was 34 x 107'8 curie/cm?, 20. “DIRT” FROM “CLEAN” BOMBS. Science News Letter 72, 3 (1957). 21. Dubinin, N. P. PROBLEMS OF RADIATION GENETICS. 26, No. 8, 22-3 (1956) (in Russian). Vestnik Akademii Nauk S.S.S.R. A general review is presented of recent experiments in genetics. Mutant and hereditary effects of the increase in natural radiation and that released by atomic and hydrogen tests were analyzed. Achievements and the possibilities of applying radiation in the induction of selective plant mutations are discussed. 22. THE EFFECTS OF NUCLEAR WEAPONS. Samuel Glasstone, ed. Government Printing Office, (1957), 587p. $2.00. Washington, U.S. The most recent data concerning the effects associated with explosions of nuclear weapons are presented. The data have been obtained from observations made of effects of nuclear bombing in Japan and tests carried out at the Eniwetok Proving Grounds and Nevada Test Site, as well as from experiments with conventional explosives, and mathematical calculations. The volume is intended for use in planning against possible nuclear attack. 23. Eisenbud, Merril. GLOBAL DISTRIBUTION OF STRONTIUM-90 FROM NUCLEAR DETONATIONS. Scientific Monthly 84, No. 5, 237-44 (1957). Presented at the Washington Academy of Sciences Fall Symposium, Washington, D.C., on November 15, 1956. 24, FALLOUT AND RADIATION HAZARDS EXPERTS DISAGREE. Chemical and Engineering News 35, 16-19 (June 24, 1957). Over 30 experts in the fields of physics, biology, and genetics outlined what is known about radiation and its hazards and especially on the fallout problem before a special Subcommittee on Radiation of the Joint Committee on Atomic Energy. Expert opinion on the fallout problem is far from unified, but there seems to be accord on these points: (1) To date, accumulation of radioactivity from fallout has not been large; (2) A completely “clean” bomb causing nofallout, is apparently impossible; (3) Of the many radioactive materials released by nuclear explosions, strontium-90 is easily the most important; (4) Fallout is hazardous, to a degree, and some limitation on the injection of fission products into the atmosphereis desirable; and (5) It is not yet known how little radiation causes damages to man. Two points on which there is widest disagreement are uniformity of fallout throughout the world, and the biological effects of low level radiation to man. Various views on these points were presented. It is generally agreed that more research is needed on all these points. 25. FEWER TORNADOES IN AREAS OF THE ATOMIC CLOUDS. 106 and 108 (April 29, 1955). JU. S. News and World Report 26. Garrigue, Hubert. RADIOACTIVITY OF AIR AND PRECIPITATIONS. Comptes Rendus 243, 584-85 (1956) (in French). Since May 31, 1956, all the precipitations at the summit of the Puy-de-Dome, have been contaminated with artificial radioactive products. The flight survey of June 15 confirms these results. 27. Honda, M. A PROPOSED METHOD OF ANALYSIS OF RADIOACTIVE SUBSTANCES IN RAIN WATER. Japan Analyst 3, 368 (1954). Ion exchange, using Amberlite IR-120 and Dowex 50 cation exchange resins, is proposed as a method of analysis of radioactive substances in rain water. 28. Hunter, C.G. RADIATION INJURIES IN ATOMIC WARFARE WITH STRESS ON FALLOUT. Canadian Medical Assoctation Journal 16, 394-401 (1957). 29. Jacobs, Paul. CLOUDS FROM NEVADA; A SPECIAL REPORT ON THE AEC’S WEAPONSTESTING PROGRAM. The Reporter 16, 10-29 (1957). 30. Kellogg, W. W., Rapp, R. R., and Greenfield, S. M. Meteorology 14, 1-8 (1957). 166 CLOSE-IN FALLOUT. Journal of - dts