“…From reports dealing with infants with other conditions it appears that pancreatic enzymatic activity is often depressed in acute and chronic diarrhoea and sometimes during respiratory infections. This depression is often selective, one enzyme being present in normal amounts whilst the other two show lowered values or are absent (Hess, 1913;Davison, 1925;Farber, Schwachman and Maddock, 1943;McDougall, 1950). This demonstrates the need to examine the activity of all three pancreatic enzymes in the duodenal juice in suspicious cases and not to rely merely on a trypsin estimation as is the procedure in many centres.…”