5. CONCLUSIONS The radioactivity of the six groups of organisms by islands is summarized in Table 20. The individual counts for pre-shot samples ranged from 0 to 80,000 d/m/g of wet sample and the distribution of counts was strongly skewed to the left. A count of zero was obtained from samples collected at all islands and for most of the groups. For the post test samples, to 14,000,000 d/m/g wet. or Igurin. individual counts ranged from 0 The few zero counts were from Japtan Counts of 1,000,000 d/m/g or greater were obtained from all groups of living organisms other than land vertebrates. The distribution of post test counts was also skewed to the left. The average values (Table 20) are those of all samples pre- pared for counting and may include more than one semple from one specimen. A comparison of one group with another is limited py the differences between species and tissues as well as by the variations in sampling; however, the number of semples proces- sed warrants the belief that trends are indicated. Although the range in values for one group of organisms at one station may be considerable, the order of magnitude of differences be- tween islands and between groups is great enough to clearly indicate a constant order in the ranking of the groups and a definite pattern of distribution by stations. Ranking of the groups for both the pre and post shot col- lections (1) by the station with the greatest activity or (2) ~ 104 - oper WI TVS