BULLETIN No. 77b. 
9 
Table III.—SHOWING AMOUNT OF SOLUBLE ARSENIC IN ARSE¬ 
NICAL MIXTURES, HAYING IN SOLUTION COPPERAS, COPPER- 
SULPHATE , AND IRON CHLORIDE, TOGETHER WITH THE EFFECT 
ON FOLIAGE. 
MIXTURE. 
3 Hours. Ain’t 
As 2 0 3 in 
20 Hours. Am’t 
As 3 0 3 in 
EFFECT 
1 gal. 
100 gals. 
1 gal. 
100 gals. 
ON 
FOLIAGE. 
1 lb. white arsenic and 1 
lb. copperas in 100 gal. 
water..... _ 
.352 
35.2 
.997 
99.7 
Scorched consid’bly. 
1 lb. Paris green and 1 
lb. copperas in 100 gals, 
water ____ 
.174 
17.4 
.482 
48.2 
Scorched, but not so 
1 lb. Paris green and 4 
lbs. copper sulphate in 
100 gals, water_ 
.051 
5.1 
.109 
10.9 
much as above by 
one-half. 
Scarcely any injury. 
1 lb. Paris green and 4 
lbs. iron chloride in 
100 gals, water_ 
.550 
55.0 
.976 
97.6 
Scorched consid’blv. 
1 lb London purple and 4 
lbs. iron chloride in 
100 gals, water. 
.746 
74.6 
.894 
89.4 
Slightly less than 
1 lb. white arsenic and 4 
lbs. chloride iron in 
100 gals, water... 
.518 
51.8 
1.475 
147.5 
above. 
Worst result in whole 
lot; burned rather 
badly. 
Arsenites in Bordeaux Mixture. 
Tables I and II show the absence of soluble arsenic where Paris 
green and London purple are mixed with standard Bordeaux Mix¬ 
ture, and the same would be true of White arsenic. Practical tests 
of the effect upon foliage of combinations of Paris green and 
London purple, each with Bordeaux Mixture, were made. These 
combinations contained one pound of Paris green and one pound 
of London purple separately in 150 gallons of Bordeaux Mixture 
and applied to fig, grape, mulberry, blackberry, peach, pear, and 
apple leaves. Each mixture was tested for soluble arsenic, but none 
was found in any case. Nor did the slightest injury result to any 
of the leaves from these combinations. Some experiments were 
also made with combinations containing 1 pound of the arsenites 
to 100 gallons of Bordeaux Mixture with the same results as the 
above. Both theory and practice show these combinations to be 
perfectly harmless to foliage, and that they may be used with 
freedom. 
