ii6 Indian Museum Notes. [Vol. IV. 



Dissolve the soft soap in boiling water and add to the kerosene. 

 Then by working a small force pump in the mixture it can be 

 readily churned into an emulsion. Any one possessing the Chis- 

 wick sprayer may unscrew the pump from the knapsack and use it for 

 this purpose. 



The emulsion, which is complete by five minutes use of the pump, 

 is milk-like in appearance and thickens on cooling and standing. 

 It may be kept some days without fear of deterioration. For use it 

 is diluted with 9 to 25 parts water, and in these experiments 15 parts 

 was the quantity chosen. The sulphur was added in the proportion 

 of I oz. to a gallon. 



No. 5.— The makers give some latitude in the final dilution. The 

 proportion used was one to ten of water. 



Nos. 6 and 7. — These were diluted according to the accompany- 

 ing instructions of the makers. 



Dry weather favoured the application of the insecticides and no 

 rain fell till 6th May. 



The plots were examined on 1st May and reported on as 

 follows: — 



Plot No. I. No live spider to be found. 



„ J. About 90% dead; a few weak and struggling. 

 „ 4, Slightly superior to No. 3. 

 „ 5. Similar to No. 3. 

 „ 6, Inferior to Nos. 3 and 5. 



,, 7. Similar to No. 6, excepting bushes that were 

 rather liberally sprayed. 



Examined 5th May. No rain since last examination. Plots all 

 much the same, but No, 4 seems to have fallen behind Nos. 3 and 5. 



Examined loth May, Heavy rain has fallen since last date. 

 Plots Nos, /, 2, J, 4, Practically free from spider. 



„ 5» ^" Less so. 



Plot No, 7« Spider numerous. 



Examined 15th May :— 



Plots Nos. /, 2. — Excellent. 



i» 3, 4> 5.— All good. 

 Plot No. 6.— Defective. 



„ 7, — Red Spider fairly noticeable. 



