UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 824 
Joint Contribution from the Bureau of Chemistry, CARL L. ALSBEKG, Chief 
and the Insecticide and Fungicide Board, J. K. HAYWOOD, Chairman 
s . j 
PROFESSIONAL PAPER ft June 3, 1920 
Washington, D. C. 
INSECT POWDER 
Has T>e®n rev, 
— see rev.ed. 
binders at 
end of file 
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 
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 Powdter . . . 65 
Previous Investigations 65 
Experimental Work 
Distribution cf the Active Principle In 
Chrysanthemum cinerarieefollum 
Summary 
Bibliography 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1920 
