10 
These were discolored when found, and I cannot say whether they died 
from the effects of water or from an epidemic disease that is destroy- 
ing these larvae in great numbers; some on this same plant being af- 
fected and afterwards died, and I think the latter more probably the 
cause. 
Experiment b. — SALT WATER. 
August 5 . — Dissolved salt in water to fullest capacity. Drenched a 
number of plants badly infested with larvae. 
Result . — On examination, 24 hours after application, I find no dead 
larvae, but the living are feeding in abundance. 
Experiment 7.— SALTPETER AND WATER. 
Dissolved in water to fullest capacity. Drenched plants thoroughly. 
Result . — Examined 24 hours after application, but find noue dead, nor 
any diminution in the numbers of the living, which are feeding as usual. 
Experiment 8.— CARBOLIC ACID AND WATER. 
Solution of 1 part acid to 100 parts water. Drenched two plants. 
Result . — This injured both plants, one quite seriously, by killing the 
younger, tender leaves, while such of the larvae as were protected by 
these leaves did not seem to have suffered. 
Experiment 9.— PYRETHRUM POWDER. 
A mixture of one part of powder to three parts flour was thoroughly 
dusted on plants with Woodason’s powder bellows, care being taken to 
get the mixture thoroughly introduced among the leaves and cavities 
eaten out by the larvae. 
This experiment was made in order to establish a basis from which 
to judge of the efficiency of other insecticides. I will further state that 
the pyrethrum powder used was sent me from the Department last sea- 
son (1884), and had been kept in a glass jar closely corked. 
Result . — Fully three-fourths of the larvae were killed. 
Experiment 10. — WOLF’S SOAP.* 
Solution of 1 ounce soap dissolved in J gallon of water, applied at a 
temperature of 90° E., by drenching plants thoroughly, first wetting 
them with water, and drenching them with same a short time after ap- 
plication of solution. 
Result . — At least one-half of the worms were killed and the plants not 
injured. 
Experiment 11. — WOLF’S SOAP. 
Solution as in 10. Sprayed lightly on several full-grown larvae and 
confined them under glass. 
Result . — None died. 
* Manufactured by the Milwaukee Soap Manufacturing Company, Milwaukee, Wis. 
