54 
FLORIDA STATE HORTICULTURAL SOCIETY. 
insecticide which would answer all 
these purposes. We compounded 
twenty-one formulae and proceeded 
very cautiously to test them. It is our 
custom to make the test at first on a 
single branch and note the injurious 
effect if any, and also determine the 
percentage of killed insects. This may 
eliminate a great many of the formulae. 
Then we would spray one-half of a tree 
with the varying strengths of those 
formulae not eliminated by the first test 
and again note the injury, if any, and 
determine the percentage of insects 
killed. After this we sprayed about 
twenty trees each with the more prom¬ 
ising and simple formulae. 
In the "Florida Grower,” under date 
March 31 and April 28, appeared an ar¬ 
ticle by the writer and Mr. S. S. Cross- 
man, from which I will quote: 
"These four formulae are selected 
from twenty-one, as being the easiest 
to make, and most effective in result. 
We do not claim entire originality for 
formulae I and II, but so far as we 
know. III and IV are original with us. 
So far as we know, no formulae for 
making an emulsion of heavy paraffine 
oil for use in spraying orange trees has 
been given heretofore. 
formula 1. 
Caustic potash whale oil soap, i l / 2 gals. 
Crude oil (not distillate oil) 
24 degrees Baume. 3 gals. 
Water to emulsify about.... i l / 2 gals. 
This will make about 200 gallons of 
spray material containing 1 y 2 per cent, 
of oil. Cost about 63 cents. 
FORMULA II. 
Caustic potash whale oil soap. .2 gals. 
Distillate oil (gas oil) 30 degrees 
Baume.4 gals. 
Water to emulsify about.2 gals. 
This will make 200 gallons of spray 
material counting 2 per cent, of oil. 
Cost about 84 cents. 
FORMULA III. 
Caustic potash whale oil soap. .2 gals. 
Paraffine oil (Diamond paraf¬ 
fine, oil) 28 degrees, Baume. .3 gals. 
Water.1 gal. 
This will make 200 gallons of spray 
material containing 1 y 2 per cent, of 
oil. Cost about $1.00. 
FORMULA IV. 
Caustic potash whale oil soap. .2 gals. 
Paraffine oil (Junior Red En¬ 
gine oil), 25 degrees Baume. .3 gals. 
Water.1 gal. 
This will make 200 gallons of spray 
material, containing \y 2 per cent of oil. 
Cost about $1.05. 
PREPARATION. 
The only precaution to be taken in 
the proper preparation is that the oil 
should be added to the soap gradually, 
while this is being stirred. It does not 
work so well to add the soap to the oil 
or to add the oil to the soap too sud¬ 
denly. This operation should require 
about a minute, when the water may 
