Analyses of human body fat obtained from 131 necropsies performed in Southern England have shown that D.D.T.-derived material and 1,2,3,4,10,10-hexachloro -6,7 -epoxy -1,4,4a,5,6,7,8,8a -octahydro-exo-1,4endo-5,8-dimethanonaphthalene (H.E.O.D.) are present.The mean content in the fat of the general population is 2.21 p.p.m. equivalent-D.D.T. and 0.21 p.p.m.H.E.O.D.The results compare favourably, as regards amounts of insecticidal material present, with those found in the general population in West Germany, and more than favourably with those found in the general population cf the United States.There are indications that equili-brium levels in the fat have been reached, reflecting the current exposures to these materials.We express our gratitude to Dr. Francis Camps and Dr.
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P C Elwood (1963) studied this question.