OF VETERINARY MEDICINE. 59 



refrains from coughing as much as possible because it is pain- 

 ful; coughs with his mouth shut, which is about the only case 

 where this occurs. 



This stage is very indefinite in length, may be from 3-20 days. 

 In moderately bad cases the mucous rattle will be heard in the 

 large bronchi. In a very severe case you will hear a squeaky 

 sound in the outer third of the lung. When you hear this you 

 can conclude that you have a very serious case on hand. These 

 sounds are spoken of as "sibilant" sounds and indicate a very 

 severe and dangerous case. They indicate that the bronchioles 

 are involved and the condition is so distinct that it has been 

 given a separate name called Bronchiolitis, which is an inflam- 

 mation of the mucous lining of the bronchioles. In the first 

 stage you are not likely to hear a rattle in the outer third of the 

 lungs but as the case runs into the second stage and through it, 

 the efiiusion is more plastic than that in the large bronchi, so 

 much so that another name is given to it ; it is called "fibrinous," 

 which indicates a coagulable character and suggests possible 

 dangers — effusion and exudation and tendency to coagulate and 

 plug the bronchioles. In this case under auscultation there will 

 be more or less dullness or possibly more or less absence of 

 sound, which will compel you to consider the case very danger- 

 ous. This may involve any part of one lung or both lungs. If 

 both lungs are involved the horse will surely die. This dull- 

 ness or partial absence of sound under auscultation indicates 

 occlusion of the bronchi. In a favorable case the fever sub- 

 sides and the mucous rattle gradually grows less, coughing is 

 less often and painful and the appetite returns. The horse has 

 been persistently standing up to this time, but he may soon lie 

 down and the lungs recover by resolution. In neglected or 

 prolonged cases the horse may retain his cough for many 

 months or even life. 



In the third stage (suppuration) some of the mucous glands 

 suppurate, the discharge from the nose then becomes muco- 

 purulent. The odor of the expiring air is fetid. This fetor is 

 a positive indication of the third stage. The temperature usually 

 remains around 103 to 104, possibly dropping a little ; pulse 60, 

 70, 75 or 78, weak, soft and small, appetite poor; horse loses 



