Issued June 3, 1926 
Revised Apri, 1926 
INSECT POWDER 
By 
C. C. McDONNELL, Senior Chemist, R. C. ROARK and F. B. LaFORGE, Associate Chemists 
Insecticide and Fungicide Laboratory 
and 
G. L. KEENAN, Associate Microanalyst, Mavechanical Laleeaters 
Bureau of Chemistry 
a 
How to Detect Adulteration—Continued 
Chemical Methods 
ipblistory 6. -« « Summary of Methods 
Cultivation and Harvesting of Insect Flowers . Writers’ Method 
Preparation of Insect Powder : Active Principle of Insect Powder 
Effect of Insect Powder on Insects Previous Investigations 
Effect of Insect Powder on Animals Experimental Work . . 
_ Adulteration of Insect Powder Distribution of the Active Principle in Chrysan- 
How to Detect Adulteration . . ! themum cinerariefolium 
Physiological Methods Summary 
Microscopical Methods Bibliography 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1926 
eR 
