PNEUMONIA 23 



and when sectioned it appears fairly dry and 

 slightly granular, presenting a marbled aspect 

 which is due to the intermixture of nearly colorless 

 inflammatory exudate and areas of congestion. The 

 third stage differs from the second mainly in the 

 assumption by the affected lung tissue of a fairly 

 uniform, opaque, grayish, yellowish, or greenish 

 tinge, in its largely increased friability, and in the 

 ready exudation from the cut surface of a thick, 

 turbid, purulent fluid; in some cases this exudate 

 is comparatively scanty; in others it is so abund- 

 ant that the lung is like a sponge saturated with 

 pus. Since pneumonia tends to spread, it naturally 

 follows that different portions of the affected lung 

 often present well-marked differences of condition, 

 and that we occasionally find all the recognized 

 stages of pneumonia present at the same time in 

 the same case. 



Inflammation may involve the lung to a varied 

 extent ; thus it may be limited to a section no 

 larger than a walnut or it may include the whole 

 lobe or even a whole lung; and further, it may 

 affect both lungs. The right lung is affected more 

 frequently than the left, and the lower lobe more 

 often than the upper. 



S5miptoms. — Although of somewhat rare occur- 

 rence, the symptoms of lobar pneumonia should be 

 known by the veterinarian. The disease is ushered 

 in with a day or two of lassitude and dullness, 

 anorexia, and restlessness. The invasion of the dis- 

 ease ,is generally marked by a rigor or a succession 

 of rigors, and the temperature rises to 104 or 106 

 degrees Fahrenheit; the respirations are increased, 

 in some cases up to sixty a minute. The breath- 

 ing is shallow and labored and accompanied by 

 more or less dyspnea; the cheeks are puffed out 



