TREATMENT 97 
capillaries where the lung tissue falls an easy 
prey to the subsequent pyogenesis. We have 
found the lungs riddled with abscesses in af- 
fected horses that have died from fistula. 
Pleurisy 
The pleura is occasionally attacked with an 
inflammatory process arising from its conti- 
nuity with the affected musculature surround- 
ing it. The deep secondary abscesses which 
burrow down to the bodies of the vertebrae and 
then descend over the costal surface are the in- 
fluential factors in this connection. At first cir- 
cumscribed, the inflammation soon extends over 
a wider surface until the subject is affected with 
a diffuse fatal sero-fibrinous pleuritis. Figure 
11 illustrates a case affected both with poll-evil 
and fistule of the withers. The subject was 
seven years and a fair type of delivery wagon 
horse weighing eleven hundred and _ fifty 
pounds. It was first attacked with poll-evil, 
but before this was submitted for treatment 
the withers were already tumefied with a 
phlegmonous enlargement. The poll-evil was 
submitted to the radical operation and 
promptly cured after thirty days. During this 
period of convalescence from the poll-evil oper- 
ation, the withers pointed and discharged a 
copious quantity of pus on the right side ad- 
