82 
Arsenite of Jhne with soda. 
White arsenic pound. . 1 
Sal soda (crystal) pounds. . 4 
Water gallon. . 1 
The ingredients are boiled in the required amount of water until 
dissolved, Avhich will take place in a comparatively few minutes, after 
which the water lost by evaporation is replaced. To every 40 or 50 
gallons of water a pint of this stock solution and from 2 to 4 pounds 
of fresh slaked lime are added. The chemical compound derived from 
the combination of the sal soda and the white arsenic is arsenite of 
soda. In the presence of lime this breaks down and arsenite of lime 
is formed. It requires 4.4 pounds of cr^^stal sal soda or 1.6 pounds 
of dry sal soda to combine with 1 pound of arsenic and 2 pounds of 
freshly slaked lime to combine with 1 pound of arsenic to form arse- 
nite of lime. It is always desirable to have an excess of lime present, 
in order to prevent all danger of burning; furthermore, this excess is 
a convenience to the fruit growers, because they can see b}^ the distri- 
bution and amount of lime on the foliage how well the spraying has 
been done. This formula, which is the Kedzie formula, with a A^ery 
few minor changes, has been used in many different sections of the 
countiT with unvarying success. In all of the practical tests under the 
advice of the writer this solution is used, and is found to be not only 
as efficient as other solutions, ])ut far cheaper. 
Arsenate of lead. 
Arsenate of soda ounces. . 10 
Acetate of lead do 24 
Water gallons. . 150 to 200 
The arsenate of soda and acetate of lead should be dissolved sepa- 
rately and then poured into a tank containing the required amount of 
water. These chemicals unite readily, forming a white fiocculent pre- 
cipitate of lead arsenate, which is easih^ kept in suspension, and can be 
used in excessive strengths on delicate plants without the addition of 
lime. When sprayed upon the foliage it forms a hlmy, adhering coat, 
which is but little affected by ordinary rains. There are several good 
preparations of lead arsenate upon the market. Some of these are 
prepared in a w^et state, others in a dry or powdered form. The moist 
l^reparations are much preferable, because the dry powder does not 
give such a good coat of poison upon the foliage. This poison has given 
excellent results in use against the codling moth, but on account of its 
expense it is comparatively little used. 
If it is desired to use Bordeaux mixture with any of these solutions 
the arsenicals are added to the Bordeaux mixture in the same propor- 
tions as they would be to a similar quantity of water. At all times 
the greatest care should be taken to prevent accidental poisoning with 
