12 
BULLETIN 1027. U. S. DEPARTMENT OF AGRICULTURE. 
12 of the samples and 0.1. 0.1. and 0.2 milligram of arsenic per liter 
in the other three. He attributed the higher content of arsenic in 
the last three samples to the fact that the wines had been sulphured. 
If. as held by Gautier and Clausmann (55), a normal wine contains 
about 0.01 milligram of arsenic, he felt that the arsenical treatment 
of vines will introduce into the wine less than 0.03 milligram of 
arsenic per liter. Mestrezat (87) considered that the only danger 
from the use in viticulture of arsenical insecticides occurs when 
they are placed near other substances which resemble them so closely 
as to be easily mistaken for them. In 1906 Forbes (39) reported 
36.6 and 32.9 parts of arsenious oxid per million in peelings of apples 
sprayed the preceding day with lead arsenate and 40.1 parts of 
arsenious oxid per million in peelings of apples gathered two months 
after being sprayed heavily with lead arsenate. He considered that 
lead arsenate could be substituted for the more common insecticide 
sprays if discretion were exercised in its use. In 1910 Giinther (60) 
reported the results given in Table 3 on fruits that had been sprayed 
once with a mixture containing 300 grams of sodium arsenite and 
-425 grams of lead acetate per 100 liters. 
Table 3. — Residue on fruits sprayed once with mixture containing 300 grams of sodium 
arsenite and 425 grams of lead acetate per 100 liters \Gunther). 
Days 
elapsed 
after spray- 
ing. 
Arsenic. 
Lead. 
Gooseberries 39 
Currants 39 
Pears 80-] 06 
Apples SO-106 
Do S0-106 
Milligrams per 100 
grams. 
1.000 2.16 
7. 140 16. 70 
.129 
. 074 Trace. 
.057 0.017 
He reported the results given in Table 4 on fruits dusted once 
with a mixture consisting of 2 parts of freshly slaked lime. 4 parts 
of sulphur, and 1 part of Paris green. 
Table 4. — Residue on fruits dusted once with a mixture consisting of 2 ports of freshly 
slaked lime. 4 parts of sulphur, and 7 part of Paris green (Giinther) . 
Days 
elapsed 
after dust- 
in?. 
Arsenic. 
Copper. 
Gooseberries 
39 
39 
39 
39 
SO-106 
• 
SO-106 
SO-106 
24 
24 
24 
iriUigram? : 
aTanis. 
0. S300 0. .560 
Do : 
2. 1200 . 930 
1.6100 
Do 
1.5300 
Pears 
. 0720 . 240 
. 0420 . 067 

Do 
. 0084 . 095 
Do 
.0420 .011 
. 2000 < . 160 
. 3200 . 250 
Plum- 
. 5000 Trace. 
