The problem of the reenforcement of milk with vitamin D has assumed increasing importance in recent years, since this type of milk in its various forms is being marketed widely throughout the country. In spite of numerous studies, pediatricians and others having to do with the feeding of infants are in doubt as to the extent to which this type of milk can protect a growing infant from rickets. The majority of studies have dealt with the problem of curing rickets already established. Up to the present, few studies have been reported on the prophylactic potency of this type of antirachitic agent.
A comprehensive review of the reports of clinical experiences with vitamin D milk published prior to October 1934 was made by Bunker and Harris.1 They expressed the opinion that irradiated milk and milk from cows fed irradiated yeast had each proved to be valuable both in the