It is sometimes necessary to feed infants who are allergic to milk a food containing no milk. The soy bean foods have been and will continue to be of value. Their chief disadvantage is that in some infants they cause large, loose bowel movements and irritated buttocks. While such trouble is not common if the food is cooked in a double boiler for three quarters of an hour, it would be of advantage to have an alternate food for use when necessary. Shohl, Butler, Blackfan and MacLachlan,1 using a synthetic protein-free food2 in which amino acids prepared from hydrolyzed casein were the chief source of nitrogen, showed that for short periods nitrogen equilibrium and good gains in weight could be maintained. This is of great theoretical interest but of less practical importance unless it can be shown that such a food is adequate for nutrition over relatively long