It is a remarkable and suggestive fact that when a person has once practised physiological economy in his diet sufficiently long for it to have become in a measure a habit, he has no desire to return to a fuller dietary rich in proteid matter. This, it seems to the writer, is convincing proof that both body and mind are fully satisfied with the smaller amounts of food, and argues in favor of the latter being quite adequate for the physiological needs of the organism. In this connection, the writer presents a few lines received during the summer from one of the soldier detachment. Nine of these men, after completing their work at New Haven early in April, 1904, were detailed for service at St. Louis, and the letter which is quoted was written simply to ask concerning some photographs that had been promised them. In the letter, however, occur two or three sentences which are interesting and suggestive. WORLD’S FAIR GROUNDS, ST. LOUIS, MO., July 8, 1904. Professor RUSSELL H. CHITTENDEN: DEAR SIR,—On behalf of the men that were undergoing the “Food Test” conducted by you last winter, I write these few lines asking whether we are entitled to any of the photographs that were taken of us in the Yale Gymnasium the last two days we were there.... The men are all in first-class condition as regards their physical condition, and are all very thankful to you. We eat very little meat now as a rule, and would willingly go on another test. Enclosed you will find a list of the men as follows: Private 1st Class Jonah Broyles; Private 1st Class William E. Coffman; Private 1st Class James D. Henderson; Private 1st Class Maurice D. Loewenthal; Private 1st Class William Morris; Private 1st Class William F. Sliney; Private 1st Class John J. B. Steltz; Private 1st Class Ben Zooman; Private 1st Class William Oakman. Trusting I may hear from you in the near future, I am, Very respectfully, (Signed) JOHN J. B. STELTZ. _Medical Department Exhibit U. S. Army, World’s Fair Station._ DAILY DIETARY OF THE SOLDIER DETAIL FROM OCTOBER 2, 1903, TO APRIL 4, 1904.