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, w T ere 
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 w'ere placed in a bag of cheese cloth, and 
thoroughly w T et 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 w r ere 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 
5, produced no effect in twenty-four hours. 
Coal-tar water .—Water in w T hich 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 twentv-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 larvae similarly treated were killed, but pupae were not 
affected. 
A small corn plant thoroughly wet with tar water August 13, 
was quite unaffected twenty-four hours later, and the same result 
was obtained in another experiment with an application of tar 
water to corn in the field, no trace of injury appearing within 
forty-eight hours. 
Although worthless if applied alone, this fluid may be found 
useful as a diluent of others. 
