The result of disease to muscular tissue is contraction of its fibres, and the contractions become more painful as the disease increases. Accompanying the inflammation, there is a more or less inflammatory product secreted between muscular fibres that "glues" them together in their contracted state. And as the anal and rectal tubes are made up of round muscular fibres, it is not hard to see how the bore of the canal can be lessened by the slow binding together of its fibres in the contracted state. The fact is that when the anal structure is invaded by inflammation, there is more or less stricture of the canal and of the orifice. Recalling the sleeve illustration, and how the wrist-band was puckered and bent back a trifle so that the contents of the sleeve would not pass out so easily, suppose you now pucker the wrist-band rather tightly, and suppose there is a forcible descent of sand in the sleeve, the natural result would be a bulging out of the lower portion of the sleeve just above the wrist-band, or place of undue constriction. If the abnormally constricted condition of the anal orifice has been growing from bad to worse for years, the locality immediately above the anal canal will become dilated or cavernous (caused by retained feces or gases), which cavity is called ballooning of the rectum. When a speculum is introduced into the rectum (as shown on page 14 of pamphlet _How to Become Strong_), and through it a bent probe is inserted to determine the depth of the dilatation or abnormal cavity, it is as if one were poking inside of an inflated balloon: hence the name. Anatomists describe the rectum as terminating in a forward pouch, which is close to the prostate gland in the male and the lower part of the vagina in the female. In some cases there may be such a slight pouch, due to the anal canal not following the direction of the rectum, and slightly turning backward; but in most cases such a normal pouch is not perceptible or observed through the speculum. The small pouch sometimes found on the anterior wall of the rectum I have thought due to a very acute inflammation on the verge of forming abscess, which often occurs in the triangular space. (See 4 in diagram in pamphlet cited above.) Immediately above the sphincter muscles on the posterior wall of the rectum the greatest dilatation is found (as shown by the bent probe), and extends on each side with less depth about the anterior wall of the rectum. The greater portion of the lower part of the rectum, which part is about three inches long, is usually involved in the dilatation or ballooning. Often the upper half or more of the anal canal is also dilated with the rectum, leaving the sphincter muscles quite bare of fatty tissue, with anal length of a quarter of an inch or less.