pei April. At present, the data have not been analyzed beyond a simple tabulation. Data will be statistically analyzed prior to preparing the paper for presentation at the International Symposium on Transuranium Nuclides in the Environment to be held in November at San Franciscec. In addition to the analyses for alpha-emitting actinides, selected tissue samples from these animals were analyzed for gamma-emitting radionuclides on the multiparameter system. It is interesting to note that detectable levels of americium-241 were found in rumen ingesta, 0.028 + 0.003 pCi/gram, and in wildlife tissues; liver contained 0.36 + 0.03 pCi/gram. e.g., fox At this time, comparison to other results is not possible, as the radiochemical data are not available. Dietary analysis of rumen ingesta continues. As reported last year, the favored plant species were two grasses, Hilarta jamesti and Orhyzopsts hymenoides; two shrubs, Furotta seens; and one forb, Salsola paulsenit. lanata and Atriplex cane- The graphical description of the diet of the fistulated steers is shown in Fig. 1 as relative percentages of the three types of plants. Vegetation is sparse but apparently adequate to maintain a herd of six cattle remaining within the study area. One cow, one heifer, and two yearling bulls are in the outer compound, and one cow and one heifer are in the inner compound. All females are pregnant. The study was originally designed as a five-year study, to be reevaluated at the end of two years. This reevaluation would determine whether to continue as designed, to modify, or to terminate the study due to lack of any measurable uptake of radionuclides. Unfortunately, the analytical data are insufficient at this time to make the evaluation and decide whether to continue as designed, or modify, which are the remaining two options. Hopefully, these data can be accumulated and interpreted during the next several months. After receiving this information, a decision can be made as to which animals to select and the number of animals to sample during the scheduled July 1975 sampling period. 44