A concentrate that would retain the virtues of cod liver oil and at the same time permit the giving of a small dose of the substance would be welcomed by infants, parents and physicians alike. Clouse,1 in an extensive treatise on vitamin D, passed over the use of concentrates with the statement that generally cod liver oil can be given, or. if there is need of a concentrate, viosterol should be used. Physicians in private practice do not feel that concentrates can be treated in such casual fashion. One sees too many infants in whom definite rickets develops in spite of the fact that adequate doses of cod liver oil have been prescribed. Babies do not all take cod liver oil willingly in teaspoonful doses, and some do not tolerate the fat in the quantities used if cod liver oil is given. There is, also, more than a groundless suspicion