8 BULLETIN" 165, U. S. DEPARTMENT OF AGRICULTURE. 



whale-oil soap, or some other spreader, as in the case of nicotine sul- 

 phate. The writer believes that quassiin has possibilities as a com- 

 mercial insecticide and that it could be cheaply prepared and 

 possibly sold at a lower price than some of the materials that are 

 now on the market. 



The foregoing data were obtained under conditions existing at 

 Sacramento, Cal., and may not hold for a more humid climate. The 

 efficiency of the quassiin should be determined for some other locality 

 before a commercial recommendation is made. 



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