EXPERIMENTS WITH KEROSENE EMULSIONS. 33 
b. Mr. Hubbard’s formula : 
Two pounds milk diluted with six pints hot water. Take six pints of 
the milk; add, with agitation, one gallon kerosene till emulsified, then 
add the remainder of the milk and continue the stirring till a smooth 
emulsion is formed. This also contains 50 per cent. kerosene, and costs 
35 cents per gallon, , 
I experimented with the following dilutions: 
Soaps and milk. 
a. 1 gallon standard emulsion to 9 of water. 
b. 1 gallon standard emulsion to 19 of water. 
¢c. 1 gallon standard emulsion to 24 of water. 
d. 1 gallon standard emulsion to 39 of water. 
Zamia solution. 
a. 1 gallon standard emulsion to 4 of water. 
b. 1 gallon standard emulsion to 9 of water. 
Cost per gallon. 
Values. 
Whale-oil | : re P= 
soap. Rosin soap.| @ Milk. b Milk. 
Cents. Cents. Cents. Cents. 
Go PeMCentsKETOSONC: ar cicesececinnaaenccceccwciccceas 3 2.6 2. 2 gan 
b. 24 per cent. kerosene............-.-----.----2-2--- 1.5 1.3 neal A575 
Oe) a POLICONL. KOLOSONG <2 .coceewncncrcesceencinscsso= 1.2 1.04 0. 88 1.4 
api a Per CONGsKETOSON Ot. ae'ss es < eels ne sincloesocesenc ss 0.75 0. 65 “0. 55 0. 88 
Zamia. a, 5 per cent. kerosene; cost 1 cent per gallon. b, 24 per 
cent. kerosene; cost 0.5 cent per gallon. 
COMPARATIVE STABILITY. 
After standing 10 days in quiet, the soap solutions in part disinte- 
grated. The oil remained in and through the soap, which formed a 
gelatinous mass. Heat and agitation reunited the ingredients. 
The milk emulsions separated into layers. The serum below easily 
united by shaking vigorously. 
Condensed milk, a: in ten days asmall amount of serum separated, 
but oil globules could not be seen; b acted but little differently, a trifle 
less serum. 
Zamia.—This in ten days showed no oil globules, but appeared about 
as well as when first made. 
EXPERIMENTS. 
1. Fifty large trees badly affected with Mytilaspis. Eighty gallons 
of dilution a of a milk were applied with a fountain pump. The second 
2593 OR——3 
