SUMMARY AND CONCLUSIONS In limited anthelmintic studies with toluene and some of its halogen substitution products, namely, the ortho-, meta-, and para-isomers of chloro-, bromo-, iodo-, and fluoro-toluene, and 2 di-substituted derivatives, namely, 2,6-dichlorotoluene and 2,5-dibromotoluene, it was found that the introduction of halogens into the ring usually caused a reduction in efficacy . In...