439 
weeks. Suddenly, however, a fresh deposit occurs, either in extension of the 
original seat of the disease or in another part of the lungs, and under these 
circumstances a fatal termination is the usual result. 
V. APPEARANCES AFTER DEATH. 
Animals that are slaughtered or are permitted to die in advanced stages of 
the lung plague present. the following characteristics : 
The internal changes are confined almost entirely to the chest. On opening 
this, by splitting the brisket, as the animal lies on its back, layers of yellowish, 
friable, false membrane, of varying tenacity, stretch across around the sac (peri- 
cardium) containing the heart. These adhesions exist on one or both sides of the 
chest, and are sometimes altogether absent. They are found bathed in a yel- 
lowish, grumous fluid or serum, highly charged with albumen and shreds of 
solid deposit. Portions of one or both lungs are found more or less firmly 
adhering to the membrane (pleura) covering the ribs and diaphragm, and in 
passing the hands, especially round the large posterior lobes of either lung, it is 
difficult, in advanced stages of the disorder, to detach the diseased portions of 
the organ from the ribs. 
The false membranes, disposed in layers which may be stripped off the pul- 
monary surface, are found adhering more or less closely to it, and the membrane 
_ (pleura) covering the lung, which is usually smooth and glistening, is rough, of | 
a mottled color, and with more or less marked papillary or warty-looking emi- 
nences. These are the vascular offshoots of the membrane feeding the deposit 
around, and in time the process of growth and formation of vascular or blood- 
carrying tissue may lead to as solid a connection between the lung and the sides 
of the chest as between healthy tissues. Such complete development is only 
seen in very chronic cases or animals that have recovered from the disease. 
The fluid around one or both lungs varies in amount from a few ounces to 
several gallons. At times it is tolerably clear when warm, and gelatinizes on 
cooling. At others it is difficult to separate it from the shreds of lymph and 
false membranes in the meshes of which it is held. Pus cells frequently abound 
in it, and it assumes in a few cases the character of pus. It is especially purs- 
lent when abscesses have formed in the gangrenous lung tissue, and an opening 
has led to communication between the lung tissue and the pleural sac. Under © 
these circumstances the foetor noticed on opening the chest is intolerable. 
On removing the lungs, great variations in extent but uniformity in essential 
appearances of disease exist. 
In recent and mild cases one lung is found affected. Its surface may be 
smooth from the absence of deposit around it. Parts of the organ are collapsed, 
as in health, and the usual normal pink color is noticed. The affected part is 
swollen, hard, and mottled. On cutting into this, the older diseased portions 
present a very peculiar marbled or tesselated character. The substance of the 
lobules is solid and of a dark red color, and the tissue between the lobules is 
of a yellowish red, more or less spotted with red points, but sometimes of almost 
pure yellowish white*color. 
The more recent deposits are distinguished mainly by a lighter red color of 
the thickened lobules, and there are gradations from this condition to that in 
which the lobules are but slightly infiltrated with semi-liquid serum, and air 
still passes more or less into their air vesicles. 
As the disease advances the extent of solidified and darkened lung increases, 
and portions of the lung tissue lose more or less the marbled appearance, from the 
blood-staining of the interstitial deposit. The consolidation of structures 
advances so that the blood vessels are obstructed, the diseased lung loses all 
means of nourishment, and the older, darker, and more solid portions become 
detached, so that they remain as foreign bodies imbedded in cavities in the 
