40 



The same day 16 chinch bugs were placed on a grass plant, the 

 whole thoroughly wet with tobacco water, and placed under a bell 

 jar. In an hour nine bugs were apparently dead, and in 16 hours 

 all were dead but one. 



On the other hand, eight chinch bugs sprayed on a plant of 

 grass and enclosed, with the plant, in a cheese-cloth bag, were all 

 alive four hours later. 



September 4, 17 bugs treated like the lot last mentioned, were 

 all dead but one in 24 hours. 



September 6, 12 bugs treated as above; in 26 hours seven were 

 dead, five alive. 



September 6, 69 bugs were placed in a bag of cheese cloth, and 

 thoroughly wet with tobacco water, and a potted grass plant was 

 also thoroughly sprayed, together with the surface of the ground 

 about it. The bugs and plant were then placed together in a 

 netting bag and kept for 25 hours, at which time four were able 

 to crawl, five others showed signs of life, and 60 were dead. 

 Three were already imbedded in one of the fungi of disease, show- 

 ing the presence of this contagion among our experimental lots, 

 and, to some extent, vitiating all our results. 



From the above it is evident that this fluid is less effective than 

 the kerosene emulsion, but may still be deserving of further ex- 

 periment. 



Lobelia water. — A strong decoction of lobelia, applied August 

 6, produced no effect in twenty-four hours. 



Coal-tar water. — Water in which coal-tar had been stirred and 

 shaken until saturated with the soluble parts of the tar, was found 

 to have but slight effect. Of fifteen adult chinch bugs sprayed on 

 a grass plant, August 14, only one was dead next day and that 

 by accident. 



August 15, a similar experiment made with twenty-two chinch 

 bugs (adults), had a similar result — not one was killed. 



August 16, twenty-two adults were treated as above, except that 

 the fluid was prepared by boiling tar in water. Only two were 

 dead in twenty-four hours. 



Another lot of bugs, sprayed with tar water September 4, were 

 all alive but one (young) twenty-four hours later. A number of 

 young larvjB similarly treated were killed, but puptie were not 

 affected. 



A small corn plant thoroughly wet with tar water August 13,. 

 was (juite unaffected twenty-four hours later, and the same result 

 was obtained in another experiment with an ap[)lication of tar 

 "water to corn in the field, no trace of injury appearing within 

 forty-eight hours. 



Although worthless if api)lied alone, this fluid may be found 

 useful as a diluent of others. 



