Sharp and pointed bodies are especially liable to be entangled in the cells of the reticulum; so that this viscus is the most common seat of the resulting trauma. Around this there occur hyperæmia, exudation, thickening and centrally ulceration, which may lead into a fistula or abscess, confined it may be to the wall of the viscus, or continued into the surrounding organs. In this way may be implicated, the liver, the spleen, the diaphragm, the abdominal or thoracic walls, the lung, the pericardium or the heart. The pus is always fœtid and usually mixed with alimentary matter. If it approaches the surface it may burst and allow exit to the offending body. If it encroaches on the liver, symptoms of hepatic disorder supervene. Its progress through the lung or pleura is marked by objective symptoms of pulmonary or pleural inflammation (crepitation, flatness or percussion, creaking or friction sounds), but without the customary amount of hyperthermia, and with some evidence of gastric disorder. When the pericardium is reached there are the usual signs of pericarditis, attended by comparatively little fever, and a doughy swelling beneath the sternum is added to the objective signs of exudation in the pericardium. Among the peculiar routes followed by such bodies may be named the following: to the side of the ensiform cartilage; through an intercostal space; into a chondro-costal articulation; through the muscles of the flank; and even in the region of the croup. If the attendant abscess or fistula bursts into a serous cavity it determines septic peritonitis or pleurisy, while in the lung it may cause septic pneumonia. As a rule, however, this is prevented by the excessive quantity of exudation. _Symptoms._ These are extremely variable according to the seat and nature of the lesion. So long as the foreign body is confined in the rumen there is usually no symptom. Even when it has penetrated surrounding organs the symptoms are usually for a time very obscure. A few years ago a cow entered the prize ring, at the New York State Fair, was awarded first prize, and died a few minutes later from a piece of baling wire penetrating the pericardium. When symptoms are patent there are usually early indications of indigestion in the rumen, capricious appetite, sluggish and imperfect rumination, dullness, tardy movements, frequency and fœtor of eructations, colicy pains, grunting when moved, and wincing under pressure in the left hypochondrium. Pressure below, to the left of the ensiform cartilage is sometimes particularly painful.