Nature has given man two ways (outside of the action of the bowels) of getting rid of impurities, one by means of the skin and the other by means of the kidneys. It is like a motor-car with two cylinders. If one stops the other will run on for a time, but its wear is increased. When a man stops exercising and ceases to carry off by means of his skin some of these impurities, he throws an additional load on his kidneys. When a man goes without exercise and begins to accumulate fat, that fat gradually deposits itself and not alone about the waist; it invades the muscular tissue all over his body even to his heart. As this accumulation grows there come with it a muscular slackness and a disinclination to exercise. The man is carrying greater weight and with less muscular strength to do it. No wonder that when he tries to exercise he gets tired. He is out of condition. Hence he begins to revolve in a vicious circle. He knows that he needs exercise to help take off the fat, but exercise tires him so much, on account of the fat, that he becomes exhausted; usually he gives it up and lets himself drift again. As his abdomen becomes more pendulous his legs grow less active. As his energy wanes his carriage becomes more slack. He shambles along as best he can, if he is positively obliged to walk. His feet trouble him. Altogether he is only comfortable when riding. When he has reached this state the insurance companies regard him as a poor risk, and instead of enjoying the allotted threescore and ten years of real life he falls short by a decade; and even then the last ten years are but "labor and sorrow." AS THE YEARS GO ON The first thing that a man begins to lose through the inroads of age is his resistive power. He may seem in perfect health so long as there is no special change of conditions, but when he is placed in a position where he needs his resistive forces to throw off disease, he finds that he cannot command them. Still another change is continually taking place; as the man goes on in life, little by little the control of his muscles leaves him. Instead of running about as does the youth, recklessly and with never a thought of being tired, he begins to favor himself by walking in the easiest possible way, until soon he is balancing on one foot and then tilting forward on the other, making no muscular effort and preferring the motor-car or the trolley whenever it is at hand. As an inevitable result, some of the muscles atrophy, and even those that do not deteriorate speedily discover that they have no master, and they act when and how they please.