New York AGRICULTURAL EXPERIMENT STATION. Zur 
A tree was selected that had been sprayed thirty-nine days pre- 
viously (July 14) with bordeaux mixture, containing five pounds 
of arsenate of lead to fifty gallons of the spray. Most of the 
application had apparently washed off during the interval. The 
larger limbs of the tree were cut back and the tree was enclosed in 
a strong bag of mosquito netting in which twenty beetles were 
placed. 
On the same day another tree was selected from a block of 
poplars which had been sprayed August 6 with arsenate of lead, 
using three pounds of the poison to fifty gallons of water. Dur- 
ing the intervening seventeen days all but a trace of the poison 
had apparently washed off. This tree was bagged as the preced- 
ing one and twenty beetles were also confined. 
A third tree was chosen from a block of Atak that had not 
been sprayed and was covered with mosquito netting to contain 
twenty beetles, to be used as a check. In three days the effect of 
the poison began to show upon the activities of the beetles, for 
the individuals on the sprayed trees appeared dormant. On Sep- 
tember 5, thirteen days after being put on the trees, the contents 
of the bags were examined. All the beetles, forty in number, on 
the sprayed trees, were dead. Of the twenty specimens on the 
check tree, only four were dead. The remaining sixteen were 
apparently not affected by being enclosed in the bag of mosquito 
netting. 
CONCLUSIONS OF THE EXPERIMENTS WITH POISON. 
While the experiments with poison sprays were conducted accord- 
ing to laboratory methods and the number of. beetles involved in 
the experiments was limited to about three hundred, the results are 
encouraging and indicate that thorough spraying with an arsenical 
poison of the poplar and willow plantations about July 15, will 
materially reduce the number of beetles and thereby lessen the 
number of eggs deposited in the trees. 
THE EFFECT OF CONTACT SPRAYS UPON THE HIBERNATING LARVAE. 
A number of experiments have been made to determine the effect 
of various washes, composed largely of lime, kerosene and arsenical 
poison in combination. These washes were applied during the 
winter to learn the effect upon the young larvae. In each case the 
application had no appreciable effect upon the larvae. 
