120 
FLORIDA STATE HORTICULTURAL SOCIETY. 
If the ^‘bugs” are plentiful add one 
pound of Paris Green to 50 gallons of the 
above mixture. A paste should be made 
of the Paris Green by mixing it with a 
small amount of water before putting it 
into the sprayer. 
Potassium ferro-cyanide, is used to de¬ 
termine if enough lime has been added to 
combine with all the copper sulphate. It 
is a yellow poisonous salt which dissolves 
readily in water. Ten cents’ worth dis¬ 
solved in about ten times its bulk of water 
will ordinarily be enough for one season. 
In using this test, pour into your spray 
barrel 25 gallons of the milk of lime. Stir 
the mixture thoroughly and add a drop of 
the potassium ferro-cyanide. If enough 
lime has been added the drop will not 
change color when it strikes the mixture; 
however, if sufficient lime has not been 
added it will immediately change to a dark 
reddish brown color and more lime must 
be added. Even after the test shows no 
color it is best to add a little more lime. 
Corrosive Sublimate Treatment for 
Scab—Covrosive Sublimate or bichloride 
of mercury is sold in form of white crys¬ 
tals. ^ It may be bought at any drug store 
for about fifteen cents an ounce. The 
cost of material for treating the seed for 
an acre will not exceed fifty cents. The 
solution is made by placing one ounce of 
this chemical in an earthem or wooden 
dish containing one gallon of hot water. 
As soon as it i^all dissolved pour the con¬ 
tents of the dish into a wooden vessel con¬ 
taining seven gallons of water. Put the 
potatoes into this solution, and let them 
remain an hour and a half. The solution 
may be used a number of times. The 
disinfection may be done at any time. Ex¬ 
periments indicate, however, that treating 
the tubers about a week before planting, 
and spreading them on the floor or ground 
where they will be fully exposed to the 
light, greatly facilitates their growth after 
planting. Corrosive sublimate is a deadly 
poison to both man and animal when tak¬ 
en internally, but the solution and treated 
potatoes may be handled freely without 
experiencing any ill results. 
Formula. 
Soak potatoes.i 1-2 hours. 
Corrosive Sublimate.i. . i ounce. 
Water...8 gallons. 
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