The relative value of dried lactic acid milks, liquid lactic acid milks and sweet milk mixtures as a diet for infants over long periods of time has not been established. The study here reported was made on a group of infants delivered in the obstetrical department of the University of Illinois Research and Educational Hospital, together with a few cases from outside sources. Mothers were instructed to return when their babies were 1 month of age, if the infants were strictly breast fed, or when they were 3 weeks of age if partially breast fed or artificially fed.
The experiment was begun, Dec. 10, 1929, and was carried on for ten months, ending Oct. 10, 1930. Of 186 infants transferred to our service between Dec. 10, 1929, and June 10, 1930, 116 were selected. Of these, twenty-three breast fed and eight artificially fed were dropped because of insufficient cooperation. The