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The rules above for comparing LC50s were passed on to me by H. F. Smyth. They reflect the experience of industrial toxicologists and an article on this can be consulted: Hodge, H. C. and Sterner, J. H. Tabulation of Toxicity Classes. Amer. Ind. Hyg. Assoc. Quart. 10, 93-96, 1949.