NOTES AND ABSTRACTS^ 



683 



retards the settling markedly. In one test more of the compound settled 

 out in fifteen minutes without soap than in fifteen hours with it. 

 Whereas in the case of most arsenical compounds some injury to the 

 bark is apparent, none appears to be caused by this substance. 



Used at the rate of 1 lb. to 50 gallons of water, it was sprayed on 

 potatos as a poison for Colorado beetles with quite satisfactory results. 

 Cabbages were also sprayed to rid theip of the cabbage butterfly cater- 

 pillar and the diamond-back moth, 3 lb. to 100 gallons being used with 

 entirely satisfactory results. Its cost is 20 cents per lb. retail. — F. J. C. 



