DO SOME INSECTS INJURIOUS TO TRUCK CROPS. 
of them being found dead soon after spraying. Forty-three dead 
larvae were found in a furrow beside one plant which contained 29 
dead larvae. In another place 112 dead larvae were counted in 3 
feet of furrow. 
RESUME OF EXPERIMENTS, AND CONCLUSIONS. 
Experiments 1, 2, 3, 6, and 7, in which Paris green was used at the 
rate of 5 to 8 ounces in 50 gallons of water, were failures because in 
each case the rain which followed the application washed off the 
poison. 
Experiments 4 and 9, in which arsenate of lead was used at the rate 
of 2 pounds to 50 gallons of water, were also failures for the same 
reason. 
Experiments 8, 10, and 11, in which copper arsenite was used at 
a rate of from 10 ounces to 1 pound in 50 gallons of water, failed, 
not because of burning the foliage, as was feared, but because the in- 
sects were not killed. 
Experiments 5, 12, 13, 14, and 15, in which arsenate of lead was the 
insecticide employed at the rate of 2 to 3 pounds in 50 gallons of 
water, were successful in each case. 
The results of this series of fifteen experiments show conclusively 
the superiority of a spray of arsenate of lead to one of Paris green 
when applied under suitable conditions. It is in every way more 
effective and more satisfactory than the latter, as Paris green is so 
likely to be washed away by the frequent rains of the wet season of 
Florida. These remarks apply practically to all cutworms, cater- 
pillars, and other larvae which devour truck and related crops in 
central Florida or similar regions. 
ADHESIVE COPPER ARSENITE MIXTURE. 
The preparation of copper arsenite used in the experiments that 
have just been reported was stated by its inventor to be free from 
soluble arsenious acid and to possess the adhesive properties found in 
no other adhesive insecticide. It was stated to be composed of 36 
per cent dextrin and 4 per cent gum and was prepared to be used in 
conjunction with lime in the proportion of 1 part by weight to from 4 
to 6 parts of lime — either dry or in solution, according to the foliage 
to be tested. The inventor also expressed his confidence that this 
insecticide would prove a most economical one for general garden 
and other use, as the loss by wind and rain would be reduced at least 
50 per cent and the first cost of the article would be about half that 
of Paris green or arsenate of lead. 
Samples of this mixture were submitted to Mr. J. K. Haywood, 
Chief of the Miscellaneous Laboratory, Bureau of Chemistry, who 
furnished the following analysis, August 7, 1907 : 
