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DDT as an Insecticide

Developed during world war 2, dichlorodiphenyltrichloroethane, or DDT has been used to combat nearly every kind of
insect pest, although it has its limitations.

Since DDT is insoluble in water, and only slightly soluble in oil, it is best to place large lumps in a cloth bag, and
break them up with a hammer. Petroleum or kerosene oil solutions of more than 5% must contain a solvent. For instance,
to make a 10% solution, use 10 parts of cyclo hexane to 90 parts of oil, or 20 parts of xylene or tetrahydronaphthalene

To 80 parts of oil.

An emulsion made of 2½ lbs. DDT, 1 lb. of Triton-100, and 6½ lbs. xylene is useful as a mosquito larvicide, to louse proof
underwear, and as a residual spray. To prepare DDT as a dusting insecticide, grind 1 part DDT with 1¾ lbs. of talc if the
above is mixed with sodium lauryl sulfate, and then shaken in water, the resulting suscension can be sprayed.