To the Editor:
—The statement in the editorial "The superiority of the Kahn test over different Wassermann technics as well as other precipitation tests is shown by an analysis of the results obtained at the competitive serologic conference of the League of Nations Health Committee held at Copenhagen in 1928" cannot be "misleading" because it is true to fact, being based on actual figures in the official report of the Copenhagen conference. The opinions and data in the letter of the correspondent are of controversial character unrelated to the statement in the editorial. For the sake of clarity, however, these will be considered in detail:1. The opinion in the letter that Wassermann tests carried out by the leading European serologists which made up the membership of the Copenhagen conference are inferior to those carried out in the United States is an assumption for which there is no experimental evidence.