. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE BULLETIN No. 824 Joint Contribution from ttie Bureau of Chemietry, CARL L. ALSBERG, CUef and the Insecticide and Fungicide Board, J. E. HAYWOOD, Chairman Washington, D. C. PROFESSIONAL PAPER Jnne 3,1920 INSECT POWDER By C. C. McDonnell, CWef, R. C. ROARK, Assistant Chemist, Insecticide and Fungicide Laboratory, and G. L. KEENAN, Microanalyst, Microchemical Laboratory CONTENTS Page Purpose of Investigatioa 1 Definition 1 History 2 Cultivation and Harvesting of Insect Flowers 4 Pre
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE BULLETIN No. 824 Joint Contribution from ttie Bureau of Chemietry, CARL L. ALSBERG, CUef and the Insecticide and Fungicide Board, J. E. HAYWOOD, Chairman Washington, D. C. PROFESSIONAL PAPER Jnne 3,1920 INSECT POWDER By C. C. McDonnell, CWef, R. C. ROARK, Assistant Chemist, Insecticide and Fungicide Laboratory, and G. L. KEENAN, Microanalyst, Microchemical Laboratory CONTENTS Page Purpose of Investigatioa 1 Definition 1 History 2 Cultivation and Harvesting of Insect Flowers 4 Preparation of Insect Powder .... 10 Effect 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 Chryaanthemum cinerarieBfolium 79 Summary 82 Bibliography . ^3. WASHINGTON GOVERNMENT PRINTING OFFICE 1920. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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