~24Te fourth peak in the original elution curve occurred at pH 4.1. As above,the fsotope comprising the peak was Mn+, the total Mm>4 in clam kidney sample I amounted to 38,500 d/m. The last peak of the original elution experiment contained a total of only 20 c/m over background and occurred at pH 4.1, fraction 1. Because of the low level of activity the identity of the isotope or isotopes comprising the fraction was not determined; however, gr89, 90 are known to be eluted.at this position. Sample II Bonito liver sample II collected at Pox Island, Bikini Atoll, September 23, 1956. in Fig. €. The elution curve for this sample is shown The anions were not identified but had maximum PB energies of .03 and .45 MEV and 7 peaks of .67 and .89 MEV. The oxalate fraction contained Fe, Fe’, and Zr?9_Nb?>. The activities of Fe-? (488 d/m) and Zr9°-Nb?> (100 d/m) were determined from the 7 spectrum curve. The identification of Fe? was made by mass absorption observations. The procedures used for oxalate fractions b and ¢ may be cited as examples of the method. One-ml samples of oxalate fractions b and ¢, after drying under an infrared heat lamp, yielded counts of 11,400 and 1,240 cfm respectively in the windowless methane gas-flow counter. After the plates were flamed their counts were 29,700 and 3,510 c/m respectively. After each plate was covered with aluminum foil of 4.7 mg/em= weight the observed counts were 174 and 8 cfm respectively. In a similar experiment with six Fe?> spikes the averages of the counts were 6,190 c/m with only carrier-free Fe-> ue -& - 3d