At first, his improvement was scarcely perceptible, and I was almost discouraged. But at length, after much patience and perseverance, the suffering digestive organs began, in some measure, to resume their healthful condition, and the whole face of things to wear a different aspect. He left us to take charge of a public school. For some time after the opening of this school, his health seemed to be steadily improving, and the world around him began to have its charms again. He was in his own chosen, and, I might say, native element, which was to him a far more healthful stimulus than any other which could have been devised, whether by the physician or the physiologist. Nothing in this world is so well calculated to preserve and promote human health, as full and constant employment, of a kind which is perfectly congenial and healthful, and which we are fully assured is useful. In other words, the first great law of health is benevolence. It keeps up in the system that centrifugal tendency of the circulation of which I have already spoken, and which is so favorable for the rejection of all effete and irritating matters. It would have been next to impossible for our Saviour, with head, heart, and hands engaged as his were, to have sickened; nor was it till the most flagrant physiological transgressions had been long repeated, that even Howard the philanthropist sickened and died. Not the whole combined force of malaria and contagion could overcome him, till continual over-fatigue, persistent cold, and strong tea,--an almost matchless trio,--lent their aid to give the finishing stroke. Mr. Gray was a boarder with a gentleman who kept a grocery store, and who was glad to employ him on certain days and hours of vacation or recess, in taking care of the shop and waiting on his customers. Here the tempter again assailed him, in the form of foreign fruits, raisins, figs, prunes, oranges, dried fish, cordials, candy, etc. For some time past he had been wholly unaccustomed to these things; they had even been forbidden him, especially between his meals. As a consequence of his indulgences, and his neglect of exercise, his health again declined, and he came a second time under my care. He was partially restored the second time, but not entirely. His labors, which were teaching still, became more exhausting than formerly. Cheerfulness, hope, sympathy, conscious usefulness, and the force of many good habits, sustained him for a time, but not always. His great labors of body and mind, with a deep sense of responsibility, and the indulgences to which I have alluded, preyed upon him, and dyspepsia began once more her reign of tyranny.