104 : 
W. ZUILL. 
organ, by means of the interlobular and subjacent lymphatics, 
which are situated within the interlobular connective tissue, thus 
surrounding the entire lobule ; these interlobular lymph spaces are 
filled with a clear exudation or semi-gelatinous fluid, which gives 
such a characteristic appearance to this part of the diseased organ. 
Those distended lymph spaces surrounding a healthy lobula soon 
cause in it a pneumonia, the product of which is a true croupous 
exudation, which, filling up the entire lobule, produces what is 
known as hepatization. On post-mortem examination, these lobu¬ 
les are seen in the various degrees and stages of hepatization, 
which contrasts strongly with the infiltrated interlobular connec¬ 
tive tissue in color, giving that beautifully marked and character¬ 
istic appearance known as marbling. With regard to the micro¬ 
scopical appearance of the diseased organs and their containing 
cavity, it will be seen that the lung is enormously distended by 
means of the inflammatory product, often to several times its nor¬ 
mal size,frequently weighing from sixty to seventy-five pounds. The 
boundary between the diseased and healthy tissue is very abrupt 
and well defined. The borders of the diseased organs are rounded 
off, their angular contour being lost. The pleura is very tense, 
thickened, and appears as if covered with whitish granulation; 
beneath its surface may be seen systs or blebs of lymph and 
serum, from over-distention of the lymph spaces. The lobules 
and interlobular connective tissue can be plainly seen through the 
pleura. The diseased tissue offers little or no resistance to the 
finger, which passes into the substance of the diseased lung with 
great ease, showing complete degeneration of all the tissues of 
the organ. A more or less thin section of such tissue will break 
with a short fracture. In advanced stages of the disease, the sur- 
face of the pleura is covered with organized lymph of variable 
thickness. The macroscopy of the internal aspect of the chest 
cavity is similar in many respects to that of the visceral pleura, 
in which the costal pleura is seen to be very much thickened, as 
in the former case, and covered by fibrous exudation similar to 
that already described as covering the lung. Beneath this mem¬ 
brane we have a well-marked oedema neonatorum, forming blebs 
and sacks of lymph, as in the other case. On this account the 
