The causes of pleurisy in sheep may be largely included in the general statement—exposure. Cold washing and exposure after clipping is especially injurious. Devieusart saw 300 cases of pleurisy and thirty deaths in a flock of sheep shorn in February. If kept secluded in warm buildings sheep may be shorn in midwinter, but any reckless exposure, and any sudden reduction of the temperature of the building is liable to be disastrous. Scab and other skin affections which lead to a shedding of the wool in inclement weather may also be the occasion of widespread attacks. Otherwise the causes are essentially those of the same disease in the larger animals. The _symptoms_ resemble those of pneumonia, but with the peculiar sharp, short arrest of the inspiration, and the marked tenderness of the intercostal spaces as above described. The cough is short, dry, hacking and infrequent or suppressed as much as possible. Auscultation and percussion signs, corresponding to those found in other animals, are easily got in the newly shorn sheep. In the unshorn the wool must be parted and a stethoscope employed. The _treatment_ is mainly _preventive_, or when the disease is present, of a general nature applicable to flocks. A warm barn, with pure air, blanketing, wet compresses, to which may be added extract of henbane, and nitrate of potash in the drinking water give examples of general medication. As a derivative, aqua ammonia and oil may be applied in lines on the chest exposed by parting the wool or generally on the shorn. Where the patient can receive the requisite attention further treatment should be on lines laid down for cattle. DOG. PLEURISY. Causes, exposure to cold, etc. Chill, reaction, disturbed breathing, catching inspiration, rapid, hard pulse, hyperthermia, tender chest, friction sound, later dullness at lower part of the chest in any position. Treatment, as in pneumonia, with antirheumatics and diuretics freely. Thoracentesis. This is occasionally seen in the dog as the result of exposure, and like other diseases of the chest is easily recognized. It owns the same causes with pneumonia. _Symptoms._ There is first dulness, shivering and some excitement of respiration. To this follow the more acute symptoms, the hard pulse, the rapid, catching breathing, the animal standing or sitting on his haunches, the open mouth, pendent tongue, the injected mucous membrane, the costiveness, but above all the tenderness of the intercostal spaces, the early friction sound on auscultation, the pain and normal resonance on percussion, the muscular twitchings and the short, suppressed, painful cough. When effusion has occurred its amount may easily be estimated by turning the animal alternately on its feet, back and haunches, and observing how high the dullness extends in these various positions.