Elimination is kept up by the alimentary tract, the kidneys, the skin, and the lungs. These four are the great pipe-line sewerage systems, so to speak, by which the body throws off its gaseous, liquid and solid poisons. The lungs momentarily strain carbonic acid out of the blood and throw it out in the expired air. They likewise exhale other noxious matters from the system. The alimentary tract throws off faeces, made up of the waste tissue from the whole system, especially the digestive organs, as well as indigestible and non-nutritious portions of the food. The kidneys strain out urea, uric acid, and certain other poisons from the blood and eject them through the urinary tract. Finally the skin likewise is an excretory organ and exhales a very definite amount of gaseous and fluid waste in the course of each twenty-four hours. The skin throws off all the way from a pint to two quarts of liquid each day in the form of vapor. [Sidenote: Proper Functioning.] Thus, to carry on normal elimination from the body, the breathing, digesting, urinary and cutaneous systems must be kept working normally. To impair the work of any of these is to retard bodily drainage. To make certain that elimination is going on naturally, it is necessary to secure perfect functioning of lungs, bowels, kidneys and the skin. Any stoppage in the process of elimination means that some fault has crept into the work of one of these excretory systems. It must be plain now why a disorder of any one of these organs of elimination means so much more profound disturbance to the whole organization than merely disease in one structure. It means that waste products are retained which ought to be thrown out of the body; so straightway every cell in the body begins to be more or less affected. Some poisons disturb one organ more and some another, but in the end the whole body must inevitably be affected. Lack of exercise, bolting of food, eating soft, starchy things, failure to chew properly, failure to get enough roughage, insufficient water, insufficient fruit--these are the general causes of stoppage in the elimination processes. Drink one or two glasses of warm water, not hot, the first thing in the morning. Eat one or two apples, skins and all, every day. Eat toast, especially the crust. Eat cracked wheat or whole wheat bread often. Exercise plenty. Keep cheerful. Eat regularly. Very likely you eat too much. You don't need three big meals a day unless you work outdoors at hard physical labor. Your body is an engine. No use to keep the boiler red hot and two hundred pounds of steam on if your work is light. Good health depends upon proper assimilation and elimination as nature intended. Eat less, exercise more, you who work indoors. If you don't use this caution, you are just slowly killing yourself. 23. [Sidenote: Never Say "Can't."]