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 



