Two important factors are demanded by physicians of the present day in solving the problem of rational medicine: First, a means of saving time; second, exact methods of work. I have long felt that the artificial feeding of infants should be reduced to a more exact system, and that in this way an endeavor should be made to rescue this important branch of pediatrics from the pretensions of proprietary foods and the hands of ignorant nurses. With this purpose in view, I have established a laboratory in which the materials used are clean, sterile, and exact in their percentages, and are combined in any proportion that the physician may wish to prescribe. Laboratories of this kind should be established everywhere, and physicians should write prescriptions for their infant patients' food and put them in the hands of the milk-modifier in his laboratory, just as they write for combinations of drugs