Some three years ago I had the honor of receiving a distinguished American pediatrician as my visitor— Dr. Edwards Park of Baltimore. Among the many interesting things he told me during his all too short stay was an enthusiastic description of certain experiments on the production and cure of nutritional anemias in rats, which were being carried on at the University of Wisconsin, by Professors Steenbock and Hart. I was so impressed by what Dr. Park told me that I made myself familiar with this work and determined to attempt to apply some of the investigations to clinical medicine. It seemed to me therefore only fitting that when you did me the great honor to invite me to be your guest I could in a very small way best repay your courtesy by offering to Dr. Aldrich the subject of anemia as one of two alternatives for my address to