“…During nine periods, stool nitrogen was measured 4nd, in four of these, the urinary nitrogen was also determined. An attempt was made to keep the fat intake constant from period to period in a given subject, except between periods 9 and 10 and periods 1.5 and 16. During these periods, the subjects were fed ad libitum, with the intent of observing whether improvement in absorption obtained with pancreatin was counterbalanced by decreased intake.…”