While the elderly man has less capaoity for some forms of exercise than the younger adult, he has no less need than the other of the general and local effeots of exercise. It is in the earliest period of mature age that the most characteristio manifestations of defects of nutrition - obesity, gout and diabetes, in which lack of exercise plays an important part - are produced; and the treatment of them demands imperiously a stirring up of the vital combustión. Placed between a conviction that exercise is necessary, and a fear of the dangers of exercise, the mature man oug-ht therefore, to proceed with the strictest method in the application of this powerful modifier of nutrition. It ia impossible, however, to trace methodically a single rule for all men of the same age, for all do not offer the same degree of preservation. We might, perhaps, find a general formula for the ago at which the muscles and bones havo retained all their power of resistance, and at which the heart and vesicles begin to lose' lome of their capacity to perform their functions. The mature man can safely brave all exercise that brings on muscular fatigue, but he must approach with great care those which provoke shortness of breath.