. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN No. 824 Joint Contribution from the Bureau of Chemistry, CAUL L. ALSBERG, Chief, and the Insecticide and Fungicide Board, J. K. HAYWOOD, Chairman. Washington, D. C. PROFESSIONAL PAPER June 3, 1920 INSECT POWDER. By C. C. McDonnell, Chief, R. C. Roark, Assistant Chemist, Insecticide and Fungicide Laboratory, and G. L. Keenan, Microanalyst, Microchemical Laboratory. CONTENTS. Purpose of investigation 1 Definition 1 History 2 Cultivation and harvesting of insect 4 Preparation of insect powder 10 EQect o
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN No. 824 Joint Contribution from the Bureau of Chemistry, CAUL L. ALSBERG, Chief, and the Insecticide and Fungicide Board, J. K. HAYWOOD, Chairman. Washington, D. C. PROFESSIONAL PAPER June 3, 1920 INSECT POWDER. By C. C. McDonnell, Chief, R. C. Roark, Assistant Chemist, Insecticide and Fungicide Laboratory, and G. L. Keenan, Microanalyst, Microchemical Laboratory. CONTENTS. Purpose of investigation 1 Definition 1 History 2 Cultivation and harvesting of insect 4 Preparation of insect powder 10 EQect of insect powder on insects 13 Effect of insect powder on animals 14 Adulteration of insect powder 16 How to detect adulteration 21 Physiological methods 21 Microscopical methods 23 Page. How to detect adulteration—Continued. Chemical methods 32 Summary of methods 45 Authors' method 46 Active principle of insect powder 65 Previous investigations 65 Experimental work 74 Distribution of the active principle in Chrys- anthemum cinerarisefolium 79 Summary 82 Bibliography 83 PURPOSE OF INVESTIGATION. As in the case of many other products derived from natural sources, sophistication and adulteration of insect powder have been largely practiced, much to the detriment of the industry. The most serious form of such adulteration has been the addition of the powdered stems of the plant to the powdered flowers, which, in some cases, has been carried to the extent of complete substitution. The work reported in tliis bulletin was undertaken for the purpose of devising methods for the quantitative determination of such adulteration and for determining reasonable allowances in the amounts of stems and acid-insoluble ash in insect powder. DEFINITION. The Insecticide and Fungicide Board of the United States Depart- ment of Agriculture (143) ^ recognizes as insect powder an insecticide made from the powdered flower heads of the following species of Chrysanthemum: 1. Chrysanthemum (Pyrethru7n) ci
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