Pleuro- Pneumonia amont/st Cattle. 
347 
one upon another, but which could be easily separated from the 
subjacent pleura. The thickening was greatest at the anterior 
and middle part of the cavity. Posteriorly and inferiorly strong 
and extensive adhesions existed between the lung and the sides 
of the chest. The cavity of the latter contained about a gallon 
of liglit-sanguinolent fluid, in which masses of coagulable lymph, 
resembling lumps of fat, were observed. 
The right lung was enormously enlarged, and its pleura ex- 
hibited a ragged appearance, being covered, like the costal pleura, 
with thick layers of lymph, and presenting here and there large 
patches of a brownish colour, which gave it a mottled appearance. 
Those variations of colour were particularly marked along the 
lateral portions of the middle and posterior lobes, and the layers 
of coagulated lymph were not so easily separated from those as 
from the other parts of the lung. The pleura, when divested of 
those accidental exudations, presented in places numerous large 
and injected vessels. 
On making incisions into various parts of the lung, the pleura 
was found to be in many places considerably thickened — the por- 
tion covering the upper surface of the anterior lobe measuring 
at its greatest depth nearly three- eighths of an inch — that cor- 
responding to the upper borders of the middle and posterior lobes 
being at least half an inch in thickness. The latter portion of 
the pleura, however, became gradually thinner as it approached 
the inferior or free edge of the lung, where its greatest thickness 
did not exceed one-tenth of an inch. On removing the external 
layers of lymph from the thickest part of the pleura, the latter 
retained a considerable thickness, see fig. 1 (b), arising from the 
.a 
a. Thickened pleura. 
h. Thickened sub-pleural tissue. 
c. Thickened inter-lobular tissue tilled with cells. 
d. Hepatized structure of the lung studded with grey spots. 
2 A 2 
