Sept. i, 1924 Some Insecticidal Properties of the Fatty Acid Series 
261 
adopted as a practicable basis for fur¬ 
ther tests. In series of tests with this 
formula, used in the proportions of 1 
part of the coconut fatty acids to from 
800 to 1,200 parts of water, a mortality 
rate has been attained against the green 
apple aphid of from 94 to 98 per cent, 
equivalent to the rates obtained with 
commercial 40 per cent nicotine sul¬ 
phate in parallel tests at the same 
dilutions. 
Approximately a liter of stock solu¬ 
tion is obtained when made up as in¬ 
dicated, each 5 cc. containing 1 cc. of 
the commercial mixture of acids. 
Upon thorough shaking it readily be¬ 
comes a milky emulsion, capable of 
dilution with any ordinary proportion 
of water, and when so diluted it re¬ 
mains sufficiently stable for practical 
application. The spreading power of 
the emulsion is excellent, toxicity high, 
and cost of material extremely low. 
Prepared by this formula, coconut 
fatty acids have compared favorably 
in efficiency, pound for pound, in the 
experiments so far conducted, with com¬ 
mercial nicotine preparations at less 
than one-fourth the cost per gallon 
of spray mixture. 
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