348 Pleuro- Pneumonia amongst Cattle. 
state of the subserous cellular tissue ; the appearance of which 
differed from that of the external coagulated lymph, inasmuch as 
it was firm, and contained cells filled with a grey semi-gelatinous 
fluid. The parenchyma of the middle lobe of the diseased lung 
when cut into, exhibited a surface of dark red and indurated 
pulmonary tissue, interspersed with grey points, and intersected 
by septa of a yellowish-white structure, which contained a great 
number of cells similar to those described already in the thickened 
subserous cellular tissue with which the septa communicated. 
See fig. 1 {d). 
In another of the animals referred to in Case 33, and which was 
slaughtered at an early period of the disease, we found the right 
lung generally affected, but in a less degree than in the preceding 
case. We give in fig. 2 a drawing of a section of the anterior 
a. Indurated pulmonary tissue- 
b. Pulmonary tissue, nearly natural. 
c. The thickened pleura. 
d. Interlobular cellular tissue of more healthy portion of lunj;. 
e. Thickened interlobular cellular tissue. 
lobe in this instance. We have represented at letter (rt) an 
indurated state of the pulmonary tissue, of a bright red colour, 
and intercepted by thick septa ; at letter {b) we have a portion 
of the lung near its apex, presenting almost a natural appearance 
as regards its tissue, but an anormal one as regards its sub- 
pleural (c) and interlobular cellular tissue {d). 
The following is a description of the lung of one of the animals 
mentioned in Case 18: — 
The two lungs were partially affected, but the left more so 
than the right. On examining the former from before back- 
wards, i.e. from the apex of the lung towards its base, and along 
its upper or costal surface, the anterior lobe was found to be free 
from disease, both as regarded its pleura and parenchyma, but a 
little beyond the anterior end of the posterior lobe, and especially 
in that part of it corresponding to the space between the angles 
of the ribs and the spine, the pleura became covered with a layer 
of coagulable lymph, whilst the lung beneath was swollen and 
