1 88 Journal of Agricultural Research voi. xvii, No. s 



following points: (i) The alcoholic extracts of elliptica, uliginosa, and 

 koolgibberah (No. 296, 295, and 298) were generally efficient, while those 

 of oligosperma, scandens, and robusta (No. 299, 300, 400, and 401) were 

 only seldom efficient; (2) the powder of Derris sp. (No. no), mixed 

 with water or soap solution, was usually efficient, while the other pow- 

 ders (No. 402-406) tested by this method were found inefficient; and 

 (3) of the eight powders used as dusts, only those of Derris sp., elliptica, 

 and uliginosa (No. no, 408, and 407) were found efficient. 



