New York AGRICULTURAL EXPERIMENT STATION. 305 
definitely known. To ascertain the effect of these last factors 
liberal coats of the wash were applied to vertical glass plates 
18x1434 inches in size, which when dried were atomized with 
water, the product being caught and applied to infested apples 
under the conditions as outlined in the various experiments ap- 
pended below. The chemical and mechanical processes, if any, 
taking place, were thought to approximate the phenomena upon 
«a treated tree under ordinary conditions. This method was 
adopted because of the ease of obtaining the liquid and pre- 
cipitates, and of isolating a known number of scales and their 
progeny to prevent colonization of young from other scales. 
~ 
EXPERIMENT NO. I. 
The principal object of this experiment was to determine 
whether the soluble ingredients and the precipitates obtained 
by spraying dry lime-sulphur-salt wash with water, possess in- 
secticidal properties and, if so, how long these properties are 
retained. In Series I of this experiment the glass plate, upon 
which the lime-sulphur-salt wash has been sprayed until a heavy 
coating was formed, was allowed to dry under ordinary condi- 
tions in the laboratory for one hour. In Series II the time al- 
lowed for drying was extended for each successive apple tested. 
as shown in the table, thus furnishing evidence as to the num- 
ber of washings, or rains, required to exhaust the wash of its 
insecticidal value. 
After drying, the plate used in Series I was thoroughly 
washed with water from an atomizer. The water was applied 
at the rate of one ounce of water for each ounce of wash ap- 
plied to the plate. The water was so applied as to drench all 
parts of the plate and was drained off into a small receptacle. 
This method was followed in all cases. The solution was then 
applied to the infested apples at the rate of 17 drachms to each 
apple, which was greatly in excess of the amount that would 
adhere to the apple. The character of the wash is best shown 
by its appearance after it had dried on the apples as described 
in the tables. 
The following tables summarize the treatment with the 
soluble products of the wash secured by submitting .the dried 
lime-sulphur-salt wash to one thorough drenching with water. 
20 
