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Charles V. Riley, Micro-Organisms as Insecticides.
Scientific American Supplement, October 31, 1891, p. 13206.

Abstract of paper read before Section F of the American Association for the Advancement of Science, August 22, 1891, The author gives a review of previous experiments in using micro-organisms in the dissemination of contagious diseases among injurious insects, and dwells upon the difficulties with which this subject is still surrounded.