436 exhibit the highest radioactivity. By comparison, South American, African, Iranian, and some West Indian tea show considerably less radioactivity. Nevertheless, contamination appears to be more or less worldwide. It cannot be explained by any special pre- dilection of the tea plant for translocation of natural radioactivity from the soil, since no pre-1945 teas have ever shown any radioactive content. JOURNAL OF THE A.0.4.C. (Vol. 42, No. 2, 1959) REFERENCES (1) Nier, A. O., Phys. Rev., 77, 789 (1950). (2) Suttle, A. D., and Libby, W. F., Anal. Chem., 27, 921 (1955). (3) Eckelmann, W. R., Kulp, J. L., and Schulert, A. R., Science, 127, 266 (1958). (4) Gamma spectrometry analyses were made at the Division of Nuclear Medicine, Walter Reed Hospital. (5) Analyses furnished by the Health & Safety Laboratory, Atomic Energy Commission.