Data from other workers have been quoted which show that the baneful effect upon infants of milk of high prepasteurized bacterial content has been recognized and elucidated. Data are given covering observations in Baltimore of three years' duration, in the first two of which this hypothesis seems to be supported while in the last year it is not. REFERENCES 1. Studies from the Rockefeller Institute for, Medical Research, Reprints, Vol. 2, 1924; Arch. Pedsa., Dec., 1903. 2. Scholberg, H. A., and Wallis, R. L. McK. Chemical changes produced in milk by bacteria and their relation to the epidemic diarrhea of infants. Local Government Board. Medical Officer's Report, 1909-1910, vol. 39, pp. 504-43. 3. Ayres, S. H. and Mudge, C. S. Milk powder agar for the determination of bacteria in milk. J. Bacteriol., 5, 565-588 (1920). 4. Standard Methods of Milk Analysis of the A.P.H.A. and A.O.A.C., 1923, p. 17. 5. Van Slyke, L. L. Modern methods of testing milk aiid milk products, p. 160. 6. Swenarton, J. C., and Shrader, J. H., Comprehensive Bacteriological Study of the Milk Supply of Baltimore. 7. Bishop, F. C. Fly Traps and Their Operation, Bull. 734, U. S. Dept. of Agriculture. 8. Niven, J. Manchester Health Officer's Reports (1904-1908): Reference from Reprint No. 155, Pub. Health Rep., Dec. 5, 1913, edition of May, 1923.