THE KAHN TEST FOR SYPHILIS

To the Editor: —The recent study of Hopkins and Brunet on "The Kahn Precipitation Test for Syphilis" (The Journal, January 29, p. 311) serves as an admirable peg on which to hang some observations which seem to me to be timely, especially as they sum up fairly completely the work done by a large group of qualified observers on the value of the Kahn test. At the end of their comment on the paper they write, "Most workers consider the Kahn test a dependable procedure, but the majority consider that the Wassermann test should be used in conjunction with it." Similarly, not long ago, an article by Greenbaum entitled "Error of Basing Serum Diagnosis of Syphilis on the Kahn Reaction Alone" appeared inThe Journal(April 24, 1926, p. 1273). In his closing paragraph, the author states: "I hope that the instances listed... will serve to indicate the mistake of