This unhappy gentleman whose case we are considering may have other causes of fatigue as well, even though he never takes any exercise bodily or mental, and habitually consumes large quantities of solid food. In fact, it is the food itself, with which he hopes to refresh exhausted nature, which is very likely tiring to him. He may habitually overtax his digestive organs, and almost certainly he will have in his system, owing to his sedentary and gluttonous life, a great quantity of waste products (among which is uric acid, the father and mother of gout), which in themselves are causes of fatigue. The system is clogged--the engine, so to speak, is running laboriously,[18] with all sorts of grit and refuse hindering the smooth working of its wheels and bearings. And this fatigue may be called chronic fatigue; as long as the excess of waste products remain in the system there will be disinclination for exertion, and fatigue rapidly ensuing on it.[19] The cure is to get rid of the waste products, as far as may be, by means of exercise, and by encouraging the system to throw them off by the action of the skin, the kidneys, and the bowels, and to remove the causes of the waste products in the future by avoiding those foods which are fruitful in them. Now here, again, we find that what we may call healthy fatigue is surprisingly allied to this gluttonous fatigue, though in most cases, probably, the cure for one is the opposite to the cure for the other. The sedentary large-eater we should recommend, broadly speaking, to take exercise (extreme cases are liable to apoplexy, however), with a view to getting rid of his waste products. But it is the presence of waste products, also, which partly, at any rate, cause the feeling of fatigue in the man who has played a hard set at tennis, for exercise, as we have said, breaks down the body-cells which become waste products.[20] New cells, it is true, are, in the case of all healthy people tired with exercise, even then in process of formation, but the local fatigue of the muscles is largely due to the presence of these waste products, which the exercise has produced. Thus, strangely enough, the ignoble alderman is suffering from a cause closely allied to that which makes the open champion of the world at any game tired after his brilliant and successful defence of his title.