On the inner surface of the alimentary canal, from the stomach to the colon, there are, it is estimated, over 20,000,000 rootlets (called glands, lacteals, follicles, villi), which take up intestinal juices as roots of a plant take sap from the soil. These millions of rootlets give a velvety appearance to the alimentary canal, like a nap or downy surface. Intestinal rootlets of the small intestines, like vegetal rootlets, demand a certain amount of normal fluid and solid substance, free from noxious gas. It is the down or nap of fabrics, and not their body, that shows damage first. So it is with the frail structure of vegetal and animal life if not properly supplied with nourishment from day to day. There is probably in the vegetal bodies a continuous circulation of sap corresponding to the digestive circulating fluids of the alimentary canal. This circulation from the alimentary canal to the blood-vessels, and from the blood-vessels to the alimentary canal, involves a wonderful mechanism, facilitating the flow of several gallons daily from each to the other during the process of metamorphosis of food into flesh. You can thus see how inevitable it is that the functions of these millions of secreting and excreting rootlets will be disturbed by the clogging of the system with filth and bacterial poisons as a consequence of chronic constipation, biliousness and general foulness of the alimentary canal. Through such disturbance nutrition is diminished, cell-atrophy progresses, and emaciation becomes more marked. The progressive destruction of these rootlets, involving the pathological change indicated, will be manifest in one of its results, either costiveness or diarrhea. Often the power of properly digesting and absorbing the foodstuffs is so greatly diminished that the alimentary canal is about as useless as a soft rubber tube. Millions on millions of these glands, lacteals and follicles in the stomach and small intestines, are destroyed like the rootlets of a plant or tree in unwholesome soil. The active circulation of the digestive fluids ceases, and the sufferer is said to be costive or to have chronic diarrhea. Both symptoms are the outgrowth of many years of intestinal foulness, and indicate the degree and character of intestinal irritability and semi-starvation of the body, as a consequence of either the absorption of poisons or the excessive elimination of the vital substance of the body through diarrhea. CHAPTER III. THE INTER-DEPENDENCE OF ANUS, RECTUM, SIGMOID FLEXURE, AND COLON.