About 15 per cent. of all the soldiers examined were scored in the D class. They were ranked as of inferior intelligence, likely to be fairly good soldiers but slow in learning, short on initiative, requiring more than the usual amount of supervision, and unable to rise above the grade of private. Most D, _minus_, and E men were below the mental age of ten years; few men making a psychological score of D had the intelligence of the average normal fourteen-year-old boy. About 20 per cent. of the 1,500,000 soldiers examined by the psychological method made the score of C, _minus_, which indicated low average intelligence. These men were good soldiers, however, and did satisfactory work in routine matters. The C men, those of average intelligence, included about 25 per cent. of the drafted men and furnished a fair proportion of non-commissioned material. Those in the C, _plus_, rating, which indicated high average intelligence, included from about 15 to 18 per cent. of all the soldiers examined. This group provided not only a large amount of non-commissioned officer material, but an occasional soldier whose qualities of leadership and power to command fitted him for a commission. A man who made a score of B in the Alpha test was graded as of superior intelligence. Between 8 and 10 per cent. of all soldiers examined made the B score. This group included a large proportion of men of the commissioned officer type and a very large proportion of men fit for the higher non-commissioned officers’ details. Only 4 to 5 per cent. of the men in the Army made the score of A in the Alpha test, which means that they were able to answer in the given time, correctly, more than 135 of the 212 questions in the test. These were men of very superior intelligence—indeed, of marked intellectuality. Men of this mental type who had any leadership ability whatsoever made the various grades of commissioned officers. The practical application of the psychological tests covered a very wide range. The highest intelligence among enlisted men was required in the Field Artillery, Machine-Gun Battalions, and Signal Corps. Men of the lowest grade of intelligence served as labourers, teamsters, and in other non-combatant service, while men only slightly below the average performed the duties of an infantryman satisfactorily.