~ll- curves which tended to level out, tained, and the flattest slopes that they at- appear in Table 2. The slow decays thus include almost all of the decays available for bird and rat as well as curves for muscle and kidney animals. of most The slow rate for rats could be due to residual activity from earlier detonations in the vicinity of Biijiri Island. Muscle with its high K*° content and kidney with (in the tridacnid clam) an affinity _ for strontium would be expected to exhibit slow radioactive decay. Table 2. Summary of the nineteen curves from Table 1 and Figures 1-6, showing the most decided tendency toward leveling and the minimum steepness attained. Curve Organno. ism Tissue Latest; Curve Blope no. Organism Tissue Latest slope 35 37 40 41 45 46 47 48 49 50 skin skin muscle muscle muscle muscle muscle muscle muscle muscle -0.8 -0.8 -0,.2 -1.0 -0.5 -0.9 -0.3 ~-0.6 -0.06 -Q0.25 fish rat bird bird rat bird clam clam rat bone bone bone lung liver liver kidney kidney kidney -0.85 -0.03 ~0.63 -0.5 -0.3 -0.6 -0.5 -0.6 -0.4 fish fish crab crab fish fish fish fish rat bird 56 59 60 66 74 75 85 86 87