32 SCIENTIFIC REPORTS OF THE AGRICULTURAL RESEARCH 



Stomach contents and livers of bulls . . 3 

 Miscellaneous ...... 2 



229 



Among the items of interest in this connection were 

 samples of the commercial insecticides known as Polvo and 

 Katakilla. Polvo is a powder which upon microscopic ex- 

 amination is shown to be of vegetable origin. The aqueous 

 extract consisted largely of dextrinoid, resinoid matters 

 with some small proportion of tannin. No specific alka- 

 loids could be detected and the active principle appeared 

 to be a sapot.oxin. This was confirmed by its isolation and 

 reactions, both chemical and biological. There appeared 

 to be about 0-97 per cent, present in the sample. Katakilla 

 seemed to be a mixture of Polvo with soap. 



B. The following assistance was rendered to other 

 Sections : — 



Agricultural Section. Forty- four samples of sugar- 

 cane, 15 samples of manures and 4 samples of 

 feeding stuffs were reported upon. Eight 

 samples of milk of pure and cross-bred cows 

 were also analysed. 



Botanical Section. One sample of soil was analysed. 



Entomological Section. One sample of sodium arse- 

 nate was examined. 



Mycological Section. Two samples of fungicide were 

 reported upon. 



Indigo Research Section. Two samples of manures 

 were analysed. 



Cotton Specialist's Section. Forty samples of cotton 

 seed were examined. 



Sugar Bureau. Sixteen samples of sugarcane were 

 analysed for the Secretary, Sugar Bureau. 



Imperial Bacteriological Laboratory. Two samples 

 of feeding stuff and three specimens of the 

 stomach contents and livers of hill bulls were 

 examined for the Director and First Bacterio- 

 logist, Muktesar. . 



