_Kerosene emulsion._--Hard, soft, or whale-oil soap, 1/2 lb.; water, 1

gal.; kerosene, 2 gal. Dissolve the soap in hot water; remove from the fire and while still hot add the kerosene. Pump the liquid back into itself for five or ten minutes or until it becomes a creamy mass. If properly made, the oil will not separate out on cooling.

For use on dormant trees, dilute with 5 to 7 parts of water. For killing plant-lice on foliage dilute with 10 to 15 parts of water. Crude oil emulsion is made in the same way by substituting crude oil in place of kerosene. The strength of oil emulsions is frequently indicated by the percentage of oil in the diluted liquid:--

For a 10% emulsion add 17 gal. of water to 3 gal. stock emulsion. For a 15% emulsion add 10 1/3 gal. of water to 3 gal. stock emulsion. For a 20% emulsion add 7 gal. of water to 3 gal. stock emulsion. For a 25% emulsion add 5 gal. of water to 3 gal. stock emulsion.