In small hernias nitric acid has been used successfully in the same manner as has been described in the treatment of ventral hernia. Sulphuric acid has also been used for a similar purpose, diluting it to the extent of 1 part of acid to 3 or 5 of water. In thin-skinned animals the weaker preparations ought to be preferred, and caution must be exercised in using such preparations so as not to destroy the tissues on which they are applied. Another method of treatment is, after the contents of the sac have been returned into the abdomen, to tie a piece of strong waxed cord round the pendulous portion which formed the outer covering of the hernia. The string is apt to slacken after two or three days, when a new piece of cord should be applied above the first one. The constriction of the skin sets up inflammation, which generally extends to the umbilicus and causes the edges to adhere together, and by the time the portion of skin below the ligature has lost its vitality and dropped off, the umbilicus is closed and there is no danger of the abdominal organs protruding through it. This is what takes place when this method has a favorable result, though if the umbilicus does not become adherent and the skin sloughs, the bowels will protrude through the opening. GUT-TIE (PERITONEAL HERNIA).--In peritoneal hernia of the ox a loop or knuckle of intestine enters from the abdomen into a rent in that part of the peritoneum which is situated at the margin of the hip bone or it passes under the remains of the spermatic cord, the end of which may be grown fast to the inner inguinal ring. The onward pressure of the bowel, as well as the occasional turning of the latter round the spermatic cord, is the cause of the cord exercising considerable pressure on the bowel, which occasions irritation, obstructs the passage of excrement, and excites inflammation, which terminates in gangrene and death. The rent in the peritoneum is situated at the upper and front part of the pelvis, nearer to the sacrum than the pubes. _Causes._--Among the causes of peritoneal hernia considerable importance is attached to a method of castration which is practiced in certain districts, viz, the tearing or rupturing of the spermatic cord by main force instead of dividing it at a proper distance above the testicle in a surgical manner. After this violent and rough method of operating, the cord retracts into the abdomen and its stump becomes adherent to some part of the peritoneum, or it may wind around the bowel and then the stump becomes adherent, so that strangulation of the bowel results. The rough dragging on the cord may also cause a tear in the peritoneum, the result of which need not be described. The severe exertion of ascending hills and mountains, drawing heavy loads, or the straining which oxen undergo while fighting each other may also give rise to peritoneal hernia.