To the Editor:—In my review of acidified milks, in the March issue of the American Journal of Diseases of Children, I failed, through an oversight, to give credit to Dr. Roy M. Greenthal of Milwaukee, who appears to have been the first in this country to use milk soured by additions of acid for infant feeding. In a paper read in June, 1922, and published in January, 1923 (Greenthal, R. M., The Role of Acidified Milk in Infant Feeding, J. Michigan M. Soc. 22:9 [Jan.] 1923), Dr. Greenthal reported the successful use of milk soured by the addition of from 6 to 8 cc. of pure lactic acid to the quart of milk, approximately the proportions later advised by Marriott. Dr. Cowie referred to Dr. Greenthal's work in his discussion of my paper at the 1923 meeting of the American Pediatric Society.
Stanford University School of Medicine.