Prof. Ch. Bouchard, in his lectures on Auto-Intoxication (Oliver's trans., p. 14), says: "The organism in its normal, as in its pathological state, is a receptacle and a laboratory of poisons. Amongst these some are formed by the organism itself, others by microbes, which either are the guests, the normal inhabitants of the intestinal tube, or are parasites at second-hand, and disease producing." In the preceding chapters we have mentioned some of the most common cases of retention of excreta in the rectum, sigmoid cavity, colon, cecum, duodenum and stomach, and how the consequent foul conditions often resulted in diarrhea. Auto-infection impairs the functions of every organ in the body, by clogging the pores with poisons and filth. By the transfer of disease germs from one infected, that is, tainted, contaminated part of the body to parts that were free from infection, the kidneys, mucous membrane and skin receive these unnatural products, and their functions are disturbed thereby. The disturbance of the various organs throughout the system sets up such a multiplicity of symptoms that one gets the impression of a pandemonium--a veritable council-hall of evil spirits. The visitation is omnipresent. Infliction, misery, are everywhere. The taint of auto-generated intestinal morbific products, carried and communicated to the remotest parts, manifests itself now here now there as if it were a local trouble, and it is difficult therefore, nay, impossible, to classify scientifically the symptoms of auto-infection. A classification, though necessarily imperfect, will aid in the diagnosis and treatment of the various abnormal conditions of the stomach and intestines, that is, of mal-digestion. The sympathy, good understanding and responsiveness between the brain and the digestive apparatus are so close and intimate that the physician must take into consideration the inter-relationship of these organs before deciding which one is reporting reflex nervous symptoms, and which direct symptoms. Plutarch says in one of his essays: "Should the body sue the mind before a court judicature for damages, it would be found that the mind had been a ruinous tenant to its landlord." The digestive apparatus is, or should be, a farm for the mind, but unfortunately it usually has to wait twenty or more years before the tenant understands how to cultivate it for the uses of his intellectual and esthetical life.