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 quassin 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 ar 
now on the market. RE 
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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WASHINGTON : GOVERNMENT PRINTING OFFICE : 1914 
