The =double lifting of the flank= in expiration is not peculiar to broken wind. It is seen as well in most diseases of the lungs and even of other organs (enteritis, peritonitis) which interfere with the freedom of the respiratory act. If however it is not attended by fever but associated with the broken winded cough, the wheezing respiration, the disordered and flatulent state of the bowels, the tumultuous beating of the heart against the left side after exertion, and the slight flow of clear, watery matter from the nose, it is pathognomonic. The act of inspiration is quick and free, that of expiration is not uniform and continuous as in health, but consists of two stages interrupted by a momentary arrest. In the first stage the posterior part of the abdomen is slightly raised and it falls in laterally; then comes an almost imperceptible period of inaction, followed at once by the further lifting of the flanks to complete the expulsion of air from the lungs. The first stage seems the natural collapse of the walls of the chest and forward movement of the diaphragm, the second a contraction of the abdominal muscles partly due to an exercise of will to overcome the obstacle to the expulsion of air. In very bad or advanced cases these symptoms are more marked. The inspiration is sudden and manifested by a rapid expansion of the chest, and dropping of the belly previously supported by active contraction of the abdominal muscles. The two stages of the expiratory act are quite distinct. The first is manifested by a sudden falling in of the walls of the chest so that the ribs no longer stand out prominently beyond their interspaces; the abdomen equally rises inferiorly and falls in laterally so that a projecting ridge is formed from the lower end of the last rib to the point of the hip. This is specially marked during the period of inaction, and this is succeeded by the second effort quick and almost convulsive. These movements are so extensive that they are conveyed in a striking degree to any vehicle to which the animal is attached, especially if it has only two wheels, and a rider on horseback feels the movement still more disagreeably. When a horse is in this state the alternate rising and falling of the abdominal organs imparts a synchronous movement of protrusion and contraction to the anus and in thin subjects a rising and falling of the muscles on each side of the root of the tail. The nostrils too are kept constantly dilated. There is a _nasal discharge_, but this is very inconsiderable in the early stages of the malady. It is a clear watery or slightly grayish albuminous material without any visible admixture of pus globules, and on drying it leaves a scarcely perceptible crust. At first it appears intermittently and in minute quantities, but in bad cases it becomes almost constant, and is especially profuse after exercise.