H KM EDIAL MEASURES. 
foliage of the plat sprayed with arsenate of lead. 'For results, see 
Table XXV.) 
Table XXV. — Relative value of arsenite of lime and arsenate of lead oh insecticides, as 
shown by egg depositions at North East. Pa., 1907. 
VINEYARD OF W. S. WHEELER. 
Date of 
Size of clusters. 
Total 
Esti- 
mated 
Num- 
Num- 
Eggs 
Date 
appli- 
cation. 
Formula. 
Large. 
Me- 
dium. 
Small. 
clus- 
ters. 
num- 
ljer of 
B683- 
lx?r of 
vines. 
ber of 
canes. 
per 
vine. 
per 
cane. 
exam- 
ined. 
1907. 
Unspraved 
37 
102 
98 
151 
290 
6,420 
5,610 
1,040 
25 
.50 
256.8 
128.4 
Aug. 14 
Do. 
July 8 
0-6-2-00+ 1 quart 
Kedzie 
132 
257 
25 
65 
224. 4 
86.3 
July 27 
5-5-3-50 
% 
14 
47 
64 
25 
51 
41.6 
20.39 
Do. 
VINEYARD OF W. E. GRAY. 
Julv i-i 
Julv 2.". 
July fi 
Julv 25 
Unsprayed 
Prepared Bor- 
deaux: 1 qt. 
arsenite lime, 
2 qts. fishoil 
soap, .50 gals, 
water 
Prepared Bor- 
deaux: 3 lbs. 
arsenate of 
lead, 50 gals, 
water 
28 
119 
139 
286 
6,360 
25 
75 
254.4 
21 
107 
155 
283 
5,810 
25 
63 
232.4 
11 
49 
78 
136 
2,800 
25 
5, 
112.0 
Do. 
The vines on all these plats were quite thrifty and were carrying 
a heavy foliage. 
The second experiment for comparing the value of these two poi- 
sons against the grape root-worm beetle was made on a 12-acre vine- 
yard belonging to Mr. W. E. Gray. North East, Pa. The vineyard 
was divided into three plats, 5 acres on the east side, 2 acres 
through the middle of the block, and 5 acres on the west side. In 
this experiment a commercial brand of prepared Bordeaux mixture 
was used. The poison ingredients of the spray, however, were the 
same as in the experiments on the vineyard of Mr. Wheeler. The 
plat on the east side of the vineyard was sprayed with a mixture of 
2 gallons prepared Bordeaux mixture, 1 quart of arsenite of lime. 
Kedzie formula, 2 quails of fishoil soap, and .">() gallons of water. 
The plat on the east side of the vineyard was sprayed with a mixture 
of 2 gallons of prepared Bordeaux mixture. 3 pounds of arsenate of 
lead, and 50 gallons of water. The 2 acres through the middle of 
the vineyard were left unsprayed. As in all of our other spray exper- 
iments, the foliage in the untreated plat showed much more feed- 
ing by the beetles at the time of taking the records of egg deposition. 
A greater amount of feeding by the beetles was also apparent on the 
foliage treated with arsenite of lime than upon that treated with 
arsenate of lead. The results of these experiments are set forth in 
