Metabolism of Carotene and Vitamin A Given by Mouth or Vein in Oily Solution or Aqueous Dispersion to Calves, Rabbits and Rats

of the Headmaster of the school, and we are most grateful to him.He and others of his staff very kindly provided accommodation for the members of the Medical Research Council Group who lived at the school during the investigation.The Domestic Science Mistress and the Caterer were at all times willing to give information about the school food, and to help in many other ways.Finally, we wish to thank most warmly the boys who took part in the investigation, although it caused considerable disruption of their routine.