Pleuro-Pneumonia amongst Cattle. 
349 
indurated ; but as we proceeded backwards, or to the l^ase of the 
lung, the layer of coagulated lymph on the surface of the pleura 
gradually disappeared, and the latter presented at last only a 
slightly-thickened white and opaque aspect, the part of the lung 
underneath being somewhat infiltrated with fluid, but not he- 
patized, for it swam in water. In passing from the spinal edge 
of the middle part of the posterior lobe towards its middle or 
free edge, we found that the diseased conditions both of the 
pleura and the lung gradually diminished, and that the latter 
assumed a healthy appearance when within three inches of the 
edge. 
A vertical incision was made in a part of the diseased portion 
of the lung from the pleura, of which the coagulated lymph had 
been scraped — the surface exhibited, as in the previous cases, a 
thickened state of the sub-pleural cellular tissue: the parenchyma 
of the lung itself was red and hepatized, and was intersected by 
septa, apparently resulting from the solidified state of the inter- 
lobular cellular tissue. The pulmonary lobules, or spaces com- 
prised within the septa, did not present an uniform aspect, some 
being of a bright, others of a brown or black-red colour ; this 
appearance is represented in fig. 3 (b, b). The anterior lobe of 
a. Lymph covering pleura. 
6. Hepatized substance of lung, varying in colour and consistency. 
c. Tliickened septa. 
d. Thickened pleura. The dots point to the pleura itself lying between the 
external layers of lymph, and thickened subserous cellular tissue. 
the right lung appeared quite healthy ; such was not the case 
with the middle lobe ; the pleura and parenchyma of which were 
diseased for about three inches from its spinal to its sternal edge, 
but, as we approached the latter, the pleura continued to exhibit 
a certain degree of thickening and opacity, whilst the correspond- 
ing portion of the lung gradually assumed a healthy aspect ; a 
piece of its free edge, though covered with diseased pleura, swam 
in water. The anterior part of the posterior lobe was slightly 
indurated, and strong adhesions existed between it and the middle 
lobe ; the remaining part of the posterior lobe, i. e. the base of 
