Book digitized by Google from the library of University of Michigan and uploaded to the Internet Archive by user tpb. "The outgrowth of a course of lectures ... given by the senior author in the Department of entomology of Cornell university during the past six years. More specifically it is an illustrated revision and elaboration of his 'Notes on the relation of insects to disease', published January, 1912." - Pref Bibliography: p. 327-340 Microfilmed for preservation
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