HOUSE-PLANT INSECTS AND DISEASES 139 
To make the kerosene emulsion, use 2 ounces of 
soap (whale-oil is much better than the common), 
I quart of boiling water (over brisk fire), 2 quarts 
of kerosene oil. Dissolve the soap in boiling water, 
remove from fire, and add oil. Churn or beat until 
of the consistency of cream. If correctly mixed, 
the emulsion, on cooling, will adhere without oil- 
iness to glass. Use rain water, if possible; if not, 
add a little baking soda to the water. 
For scale insects, dilute with Io parts of water; 
for aphis and soft insects, with 15 or 20 parts 
water. In using kerosene emulsion, apply in fine 
spray. Remember it must come in contact with the 
insect to be effective. 
