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ehloro-diphenyl-trichloroethane, the generic name of the active insecticidal principle. Theoretically there are forty-five possible dichlorodiphenvltrichloroethanes. However, the term "DDT" is confined to the product obtained on condensation of chloral (or its alcohólate or hydrate) with chlorobenzene in the presence of sulfuric acid.At the present time (spring 1915) three grades of DDT are recognized by the War Production Board and the armed forces of this country-technical DDT, purified or aerosol DDT, and pure DDT. As its name implies, technical DDT is a commercial grade complying with all the specifications outlined in the Joint Armv-Navv Specifications (JAN-D-.36A, Mar. 16, 1945). As will be shown in this report, it is a complex mixture containing upwards of 70% of l-trieliloro-2,2-bis-%chlorophenyl) -ethane (hereinafter called p,jr-DDT) (I), the major impurity being the o,p'-DDT isomer, 3 -trichloro-2-o-clilorophcuyl-2-/)chlorophenvlethane (II).

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