RECENT WORK WITH HYDROCYANIC ACID GAS 20I 
treated when vines were in full bloom with the follow- 
ing: Cyanide, 18 ounces; acid, 27 fluid ounces; 1 
quart of water. The temperature was 60° F. ‘Time 
of exposure was half an hour. The work was done 
after sunset. The mealy bug was destroyed, foliage 
unhurt, but three-quarters of the bloom was injured. 
A few mealy bugs appeared at the close of the season, 
after the grapes had been gathered. A second fumi- 
gation was therefore decided upon and the results were 
satisfactory. 
Vinery B had a capacity of 3,825 cubic feet and 
contained a late variety. It was treated before vines 
bloomed with the following dose: Cyanide, 27 ounces; 
acid, 40 ounces; water, 60 ounces. ‘The application 
was made after sunset and exposed three hours at a 
temperature 60° F. The mealy bug was destroyed 
and there was no injury to vines. A few insects ap- 
peared in the autumn and a second fumigation was 
given, with the same success as in the previous case. 
Vinery C had a capacity of 1,990 cubit feet and 
was planted with an early variety. It was treated 
when the grapes were the size of peas with the follow- 
ing chemicals: Cyanide, 6 ounces; acid, g ounces; 
water, 15 ounces. The temperature was 65° F.; 
weather very sultry at the time. Time of exposure 
was forty minutes and application was made at 3 
p.M. ‘The grapes were browned and killed, while the 
foliage was uninjured. The mealy bug was de- 
stroyed. The vinery was kept on the cool side, plenty 
of air given, and splendid growth and promise of fruit 
for next year was obtained. A few mealy bugs ap- 
peared in October. Fumigation was repeated. All 
