In the paper by O. H. Callaghan and A. R. Goldfarb on page 621, Vol. 89, No. 5, November 1962, first column, line 8, the sentence beginning “Dr. C. Arbesman …” should read “Dr. C. Arbesman has used Pool C to prepare rabbit antisera and reported to us that with this serum he obtains several lines on gel diffusion against Pool C, and three lines against whole ragweed extracts.”

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