Many of the pellagra patients admitted to the Pellagra Hospital in 1917 gave a history of using diets which consisted mainly of cereals, fat pork, molasses and greens, with little, if any, animal protein. On such a type of diet, Goldberger and Wheeler1 experimentally produced pellagra in the human subject at the Rankin Farm, Mississippi State Penitentiary. To test the pellagra producing diet as regards its effect on the main urinary constituents, six normal people were placed on this Rankin Farm experimental diet as given for the week ending Aug. 8, 1915. It was intended to run the experiment for at least several weeks. Unfortunately, on the fifth day of the period of the experimental diet, the water supply of the laboratory froze and the experiment was brought to an end. Accordingly, only the data for four or five days, on the diet mentioned, are available, but these data are