The higher rates of excretion in the urine of the premature infant of both total free alpha amino nitrogen and of individual amino acids as compared to the full-term infant, the older child, and the adult have been repeatedly documented (Childs, 1952; Dustin, Moore and Bigwood, 1955; Fowler, Norton, Cheung and Pratt, 1957; Jagenburg, 1959; O'Brien, Bergstedt, Butterfield, Ibbott and Lubchenco, ...