DISEASES OF THE KESPIKATORY ORGANS. 69 



an absence of any painful symptoms in the act. As the attack progresses, 

 however, the breathing becomes much accelerated as it approaches the 

 crisis. The fever is said to last from five to ten days. ' 



If, during the early stage of the attack, the ear be applied to the 

 chest, a confused humming noise, accompanied with a harsh, dry mur- 

 mur, instead of the gentle respiratory sound peculiar to health, will be 

 heard. The duration of the dry stage is very uncertain. 



Pneumonia may attack one lung, or one portion of one lung, or both 

 lungs. The extent and position of the attack may be ascertained by 

 auscultation. 



Convalescence is indicated by the return of the pulse to something 

 like its normal condition, by restoration and continuance of warmth in 

 the extremities, by a moist state of the nostrils, or the appearance of 

 healthy mucus, and by the general relief of the symjjtoms of inflamma- 

 tion, and by a disposition to lie down. 



If, on the other hand, the disease continues to progress, the mouth 

 and nose will become cold, the nostril of a leaden hue, and the pulse 

 fluttering and indistinct. The attack may terminate in effusion of se- 

 rum, otherwise known as water on the chest, exudation of lymph upon 

 the pleural surfaces, or in tubercles, abscesses, gangrene, etc. 



A very unfavorable symptom is afforded by the discharge from the 

 nose becoming of a brownish color. It indicates a high degree of con- 

 gestion in the blood-vessels of the lungs. The change of color proceeds 

 from oozing of the coloring matter of the blood through the over-dis- 

 tended coats of the vessels. 



Occasionally the animal dies (from congestion of the lungs) about the 

 fourth or fifth day, or even as early as the second day, before any of the 

 latter described stages are reached. 



Horses sometimes die of congestion of the lungs from hard riding or 

 from plethoric state of the system. 



Treatment. — Is given on page 70. 



PLEURO-PNEUMONIA. 



Definition. — Pleuro-pneumonia is inflammation of the lung and 

 pleura at the same time. The disease may attack one lung or one por- 



