Comparative Toxicity of DDT and Four Analogues to Goldfish, Gambusia, and Culex Larvae.

Communications relative to articles offeied for publication should be addressed to Editor, 1515 Massachusetts Avenue, N.W, Washington 5, D. C. Communications relative to advertising should be addressed to THEO. J. CHRISTENSSN, 1515 Massachusetts Avenue, N.W., Washington 5, D. C. Communications relative to membership in the Association and to all matters of business of the Association should be addressed to the Administrative Secretary, AAAS, 1515 Maseachusetts Avenue, N.W., Washington 5, D. C. Annual subscription, $7.50 Single copies, 25 cents