PNEUMONIA. — DEFINITION. — PATHOLOGY. 491 



moderate doses and repeated probably every hour, or every 

 second hour, and when they have been given m combination 

 with such sahnes as sohition of acetate of ammonia. 



In treating all cases of pulmonary congestion, we must ever 

 bear in mind what has already been stated when speaking of 

 the course of the disease, that for some time after apparent 

 recovery there is a great aptitude to recurrence of the same 

 state, or even the more dangerous one of pneumonia. With 

 the view of guarding against such recurrence, care requires 

 to be exercised alike in the maintenance of an equable tem- 

 perature in the stable, a due supply of pure air, and of a natural 

 state of the skin, bowels, and kidneys ; together with gradual 

 accommodation of the horse to the work to which he may be 

 put when believed to be fit for it. 



CHAPTER XXI. 



PNEUMONIA — INFLAMMATION OF THE LUNGS. 



Definition. — Tnfiammatlon of the true lung-substance, the 

 vesicular elements, and most probably the connective-tissue 

 forming the parenchyma of the lung, and ivhich in its vmcom- 

 plicated and acute or pure form of development is attended 

 ^uith tuell-marked 'pyrexia, which, after a variable period of 

 existence, suffers distinct defervescence even ivhile the struc- 

 tured changes in the lung are decided and unremoved. 



Pathology, a. Varieties. — Inflammation in lung-tissue is 

 spoken of under different names, some of which are merely 

 synonymous or convertible terms ; others are employed to indi- 

 cate supposed differences either in the morbid action itself or 

 of its exact distribution as respects the particular lung-tissues 

 involved, or the nature of the resultant products. Thus we 

 speak of — 1. Croupous, exudative, lobar, or diffuse pneumonia, 

 because of the character of the exudate, which contains a large 

 amount of fibrinous material, and because of its generally ex- 

 tensive distribution through or amongst the pulmonary tissue. 

 2. Catarrhal, lobular, imtchy, or broncho-pneumo7iia, from the 



