526 
Journal of Agricultural Research 
Vol. XXIV, No. 6 
inoting the adhesion of the mixture, yet they may be regarded as very 
serviceable. The agar in strengths used increased the spreading 
power least and would have to be used much stronger, perhaps o.i 
per cent, but gelatin 0.4 per cent and milk 0.4 per cent were quite satis¬ 
factory for sugar beets, though only moderately so for cabbage. 
LIMB 
It has been recommended by Kilgore {14) that lime be added to 
Paris green and other arsenicals to restrain the injurious action on the 
foliage. 
On tomatoes and beans in the greenhouse we have tested quite 
thoroughly unslaked lime with calcium arsenite and, with fewer repeti¬ 
tions, with lead arsenate (Corona) and with Paris green. Quite con¬ 
sistently the use of lime has very materially reduced the burning action 
of these three arsenical compounds as shown by Table XV. 
TabIvB XV .—Effect of lime in combination with arsenical compounds 
Date. 
Plant. 
! 
Chemical. 
Amotmt 
in 2 liters. 
Lime. 
Injury. 
Gms. 
Gms. 
July 25, 1917. . 
Tomato... 
Calcium arsenite . 
1.9 
None. 
Bad. 
Do . 
.,.do. 
.do. 
I. g 
4. 6 
Do. 
Do. 
,..do. 
.do. 
0 
None. 
Defoliated. 
Do. 
...do. 
.do..*... 
0 7 
4. 6 
Partly defoliated. 
Scot. 2. 1017 
...do. 
.do. 
0 7 
2. 0 
None. 
Moderate. 
Do .... 
.. .do. 
.do. 
2. 0 
Q. 0 
Slight. 
Do 
...do. 
.do. 
y 
None. 
Partly defoliated. 
Do. 
...do. 
.do. 
0 7 
0 
Q. 0 
Moderate. 
Mar. 3, 1918... 
Bean. 
Lead arsenate 
0 7 
9 - 7 
y 
None. 
Very slight. 
(Corona). 
Do . 
...do. 
.do. 
Q- 7 
0- 7 
None. 
Do 
...do . 
.do. 
y # 
IQ. < 
y i 
None. 
Moderate. 
Do 
. . do . 
.do. 
y D 
IQ. < 
IQ. t; 
None. 
Do 
Tomato 
.do. 
Q- 7 
y 0 
None. 
Slight. 
Do. 
. ..do . 
.do. 
0 - 7 
9. 7 
None. 
Do. 
...do. 
.do. 
y i 
IQ. % 
None. 
Moderate. 
Do. 
...do. 
.do. 
y 0 
IQ. K 
IQ. K 
None. 
Scot. 2. 1017 
do . 
Paris green. 
y 0 
6. 0 
y 
None. 
Bad. 
Do. 
...do. 
.do. 
y 
6. 9 
6. 9 
Slight. 
Do. 
...do. 
.do. 
Q. 2 
None. 
Very bad. 
Do. 
...do. 
.do. 
y 
9.2 
9.0 
Slight. 
FBRROUS SULPHID 
Volck (34) especially has advocated the use of ferrous sulphid to 
decrease the burning effect of zinc arsenite. We have used this com¬ 
pound (7.2 gm. to 2 liters) many times in combination with different 
brands of calcium arsenite and of zinc arsenite and have found no gen¬ 
eral benefit in restraining the injury to the foliage. Usually the injury 
with and without the ferrous sulphid was the same, but occasionally 
it was a little more or a little less if the iron salt was added. 
EFFECTS OF LETTING MIXTURES STAND BEFORE APPLYING 
In the case of that group of arsenicals that are but slightly soluble in 
water and are often called “insoluble,'* one would naturally expect that 
if the suspension were applied as a spray as soon as mixed the amount 
