KNOWLEDGE of the basic nutritional requirements of infants has progressed to the stage where the preparation of a completely supplemented milk is considered possible. The present study was undertaken to determine whether infants fed for nine months on such a supplemented milk with the addition of only carbohydrate and an unfortified cereal would exhibit normal growth and development and remain free from vitamin and mineral deficiencies. Although the exclusive use of such a preparation would not be desirable even if it were discovered to be nutritionally adequate, such a milk could serve a useful purpose in infant feeding. McCollum and Grubb1 cited Dr. E. A. Park's opinion that efforts to educate the public to the use of the necessary supplementary vitamins had progressed as far as possible and that if the infants who still suffered from deficiencies were to be protected a basic food with the necessary vitamins added must