The first table herewith presented gives the results of investigations on students who were free from subjective and objective evidences of stomach trouble, except for some transient disturbances of function as noted. The test meal throughout this series consisted of 50 grams of dry bread, 5 grams of butter, and 250 cubic centimeters of cold water, taken as a noon meal and removed by siphonage from sixty to ninety minutes after the completion of the meal. In no instance were remnants of breakfast found. In eleven of the sixteen examinations, syntonin was either altogether absent or present in the merest trace. The maximum [ill] was 20/100 c.c. in 10 c.c. As the qualitative examinations showed some slight variations from the theoretic normal, it was with some surprise that the following facts were deduced: 1. The presence of a measurable quantity of syntonin, was not connected with a failure of free HCl.