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CHARLES V. RILEY. Kerosene emulsion and Pyrethrum. Insect Life, IV, Nos. 1 and 2, october, 1891, pp.32-33.

Short paper read before the Washington meeting of the Association of Economic Entomologists regarding the alleged difference between the omulsion consisting of kerosene extract of pyrethrum with soap and water and the emulsion prepared from an aqueous extract of pyrethrum with soap and kerosene. Adduces a communication from Prof. J. McNeill to the effect that there is practically no difference between the two emulsions.