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emulsion. For a mixture containing lo per cent, of kerosene, add 
seventeen gallons of water to the three gallons thus prepared. For 
an i8 per cent, kerosene emulsion, add eight gallons of water to the 
stock solution. Soft water is to be preferred. 
lo. The principal insect enemies of the cottony maple scale are 
minute winged parasites which lay their eggs within the bodies of 
the female parents ; and hemispherical shining black ladybugs, each 
with two red spots on the back, the larvae of which devour the eggs 
in spring within the cottony masses beneath the female body. 
