Bulletins. 1, Complement fixation in tuberculosis, by A. M. Stimson; 2, Report of investigation of diphtheria carriers [with list of references], by Joseph Goldberger, C. L. Williams, and F. W. Hachtel; 3, Excretion of thymol in urine, by Atherton Seidell; 4, Sterilization of dental instruments [with bibliography], by H. E. Hasseltine; 5, Modification of Rose's method for estimation of pepsin [with bibliography], by Maurice H. Givens.

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