Table 1. The methods used in the ion-exchange experiments Experiment wet Weight ash Digesting procedure (gms ) I Clam kidney Belle Is., Eniwetok Atoll Column resin mesh size (mm) size Flow rate ml/minute 1.10 0.142 0.2 N HCl 8x100 50-100 0.5 7.29 0.213 Aqua regia 6x50 50-100 0.5 9-22-56 II * Fish livers Bikini Atoll 9-1956 III Bonito livers Fox Is., Bikini Atoll 9-23-56 8.90 0.202 Perchloric 6x100 and concentrated HNO, 100~-200 0.5 IV Fish livers” 19.10 0.491 £Perchloric 6x100 100-200 0.5 6x100 100-200 0.5 6x100 100-200 Belle Is., Eniwetok Atoll 5-22-54 and and concentrated HNO, 6-6-54 V Top inch, island soil Belle fs., 0.906 Eniwetok Atoll te 0.888 Concentrated HCl 9-19-56 Spikes cel tt ppl As sr?” co m4 cal37 RytO6_pn}O8 7.95_ cb9>,2n95, Fe29 ae enn 0 0.994 REnt Concentrated RCL Mullet, jack, grouper, surgeon, and big-eye Miscellaneous reef fish Dry weight Kusaie Atoll collected 7-5-56 used as carrier from ale Island soil 0.2--0.5

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