SIR,—In compliance with your verbal request I have the honor to inform you that the duties of this detachment during the tour of duty at this station have been as follows:— At 6.45 A. M. the men arise and their body-weights are taken immediately, after which they dress and assemble for reveille roll-call. 7.15. Breakfast. After this meal they are all engaged in various duties about the quarters, such as inside and outside police, kitchen police, assisting in measurement of urine and fæces and transportation of the same to the laboratory; cleansing of fæces cans and urine bottles, etc. They are occupied with these various duties until about 9 A. M. 9 A. M. Detachment proceeds to Gymnasium under charge of a non-commissioned officer, and by him reported to the gymnastic instructor. 11 A. M. Detachment returns from Gymnasium. 12 M. Dinner. 1 P. M. Drill, weather permitting, otherwise a walk in charge of a non-commissioned officer, or indoor instruction relative to the duties of a soldier. 2 P. M. Relief from drill; walk, or instruction. 2.30 P. M. Instruction by a non-commissioned officer in their duties as nurses, etc. 3.30 P. M. Relief from instruction. 5 P. M. Supper. 5.30 P. M. Retreat roll-call. 10 P. M. All men in bed. This routine is the same for every day in the week except Saturday and Sunday. On Saturday drill and instruction in the afternoon are omitted, and on Sundays the men are also free from gymnasium work. In addition to the duties mentioned above, a special detail of two men is made every morning to assist in the weighing and serving of the food, and from time to time details are sent to the laboratory and reported to Dr. Mendel for such work connected with the investigation as he might assign them. Very respectfully, (Signed) WALLACE DEWITT, _1st Lieut. and Asst. Surgeon U. S. Army, Commdg. Det. H. C._ Here we have a group of men, thirteen in number, quite different in type from the preceding group; men accustomed to living a vigorous life under varying conditions, and who naturally had great liking for the pleasures of eating. Further, they were men who had no personal interest whatever in the experiment or in the principles involved. To be sure, they had volunteered for the work, and the objects of the experiment had been fully explained to them. Like good soldiers they no doubt desired to obey orders, and they doubtless preferred to see the experiment a success rather than a failure, but they had not that interest that would lead them to undergo any great personal discomfort. This point should be kept in mind, since it has a distinct bearing upon the possibility of establishing physiological economy of diet in persons who would not willingly incommode themselves or suffer personal inconvenience.