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The four isomers a-, p-, 7and 6-benzsne hexachloride (1,2,3,4,5,6-hexachlorocyclohexane)were used as target materials to study the effect of structure isomerism in the Szilard-Chalmera reaction. They were irradiated in solid state and also in banzane solution and frozen states, after which the recoil 3*Cl retained therein was stripped into 0.1 M K,SO, solution.I n the case of solid state, the radioactivity yields of the isomers decreased rapidly in the early stage of irradiation and a corresponding diminution was also seen in the difference in yield between the four isomers. The greatest yield was registered by the &isomer, followed by a-, 7and p-forms in that order, but the difference dwindled down with progress of irradiation until it became insignificant. But, when the four isomers were irradiated in benzene solution almost the same yield was obtained for all four isomers, and which value of yield did not appsar to vary very significantly with progress of irradiation. This value, moreover, was higher than in the cases of either solid or frozen states.I n the case of frozen state, the yield characteristics were intermediate between solid and liquid targets, both in absolute value and in the differencs according to structure.