EXPERIMENTS OX CHINCH BUGS. 
By Prof. 8. A. Forbes. 
MEMORANDA OF EXPERIMENTS RELATING TO USE OF KEROSENE 
EMULSIONS ON CHINCH BUGS. 
Solutions with which dilution* were made. — (1) Soap gads, 1 pound 
soap to 10 gallons water: (2) soap suds. 1 pound soap to 20 gallons 
water: (3) potash, 1 pound to 50 gallons water. 
EMULSIONS AS DILUTED. 
kea • • 
A. 2 parts kerosene. 1 part milk, 45 parrs water .. about 4 
B. 1 part kerosene, 1 part milk, 18 parts water 
C. 1 part kerosene. 1 part milk. IS parts solution 1 
D. 1 part kerosene. 1 part milk, 38 parts solution 2 2£ 
E. 1 part kerosene. 1 part milk. :>S parts water 
F. 1 part kerosene, 1 part milk. 38 parts solution 3 
G. 1 part kerosene. 1 part milk, 30 parts solution 2 about 3 
On the 22d of July I transplanted several hills of corn to the labora- 
tory, placing them in boxes about a foot and a half wide by two feet in 
length. The corn was from two to three feet in height at this time. 
Each hill was infested with several hundred chinch bugs, which were 
of various sizes, below the pupa stage. All the corn was watered once 
immediately after transplanting, and bore the removal well. It was 
kept under shelter, but in the well-lighted dome of the building, and 
fully exposed to the air. 
Experiment 1, July 22, dp. m. — Applied to a single hill from half a 
pint to a pint of emulsion A. throwing it with a small syringe upon 
the bases of the stalks and surfaces of the ground. For a check upon 
this experiment. 1 applied water to another hill in the same quantity 
and in the same way. July 23, 9 a. m.. the bugs on the first hill were 
still alive, but torpid. July 24. at 11 a. m.. about one-fifth of the hugs 
were completely dead: the others were still alive, but most of them 
torpid. July 26, 3 p. m.. thirty of the bugs were alive and back npon 
the stalk>. apparently uninjured, but all tin- remainder were dead. 
July 27. 10 a. m., the hill was in the same condition. Treated again 
with emulsion B, on the 28th, when all the bags were killed. Thos 
the hill to which water was applied were not injured in the least, hut all 
were back again upon the stalks in twenty four hours. 
