The reason for this is that each person has a cultivated immunity to a given toxic state of the intestinal contents, and when from pressure or the irritation caused by a calculus. there is a denudation of the mucosa the infection that takes place has not the power to arouse a systemic resistance' but can cause only a local inflammation; this inflammation may end in ulceration, or it may cause a thickening of the parts and interfere with drainage from mucous or glandular pockets; then the locked up secretions become intensely toxic, and this sets up a new infection much greater then l the first and powerful enough to cause the system to call out its militia to put down the rebellion. Now we have fulmination, but if food and drugs are withheld it ends soon.] "Severe abdominal pain with tense abdominal walls, fever and vomiting form the characteristic triad in the first phase of the disease; less rapidly does meteorism appear. This depends upon whether the inflammation of the serosa quickly spreads or remains local. Peritoneal meteorism is peculiar. The abdomen is uniformly distended, balloon-like; the muscles as well as the rest of the abdominal walls are tense. It must be added, how ever, that in spite of the excruciating pain upon touch there is no sign of contraction of the abdominal muscles, of the "muscular resistance" _(defense musculaire) _which is so common on pressure in other forms of abdominal pain, particularly when circumscribed." [Distention from any cause--or stretching of muscular fiber--causes paralysis for the time being.] "The same is true of the diaphragm; it is forced upward, the muscles are therefore elongated and tense; but there is no evidence of active contractions. Abdominal respiration ceases; gradually then, as may be recognized by the limits of percussion, increasing loss of _muscle tonus_ is added. In this case the autopsy showed that the peritonitis had not advanced up to the serosa of the diaphragm." [The muscle tonus when a patient is under the influence of opiates cannot be reckoned with, for that drug paralyzes the muscles, and the bowels fill with gas as was seen in this case up to the day before the abscess ruptured; on that day feeding had been suspended, resulting in a decrease of gas and an amelioration of all the symptoms.]