a. To evaluate the biological contamination of the Bikini-Eniwetok areas about 5,000 samples will be needed for ashing and counting of activity. b. Beta-gamma counts should be made of all samples. c. Alpha counts should be made of selected samples. Detailed chemical analyses are needed to determine the relative abundance of different isotopes to the total activity found in the various forms. The services of Atomic Energy Commission personnel and of staff members of other Atomic Energy Commission contractor laboratories as consultants in this phase of the work would be most helpful, especially the technical staffs of the Hanford Works and the Atomic Energy Project, University of California at Los: Angeles. Laboratory studies under controlled conditions are needed to measure the effects of the conditions observed in the field. This will require an expansion of our present program of study of the Eniwetok and Nevada materials. The time required to complete the laboratory studies will be about one year.