F. S. BILLINGS. 
72 
complications, as a consideration of a course of deuteropatliic 
gelatinous infiltration cannot self-evidently come within the 
range of this paper. 
Gelatinous infiltration is an inflammatory process in parts of 
the lungs which had a special predisposition to the same. The 
extended forms of this complication will , as a rule, regularly make 
a lethal termination ; have we yet to do with a pneumonic pro¬ 
cess in cachectic individuals ? Nevertheless, I have seen healing 
take place in such cases, where an entire anterior lobe of the 
lungs, or the median-inferior part of a lobe was diseased. The 
expectoration of the viscid and cellar mass in the alveolse is im¬ 
possible, because the lungs are not elastic enough, the bronchi 
obstructed, or the respiratory muscles too weak. Restitution re¬ 
sults through fatty metamorphosis of the cells contained in the 
alveolm. This process takes place, however, very gradually by 
horses, so that we are unable to demonstrate, at any one time, 
great quantities of fatty detritus. I have not yet seen by horses 
the termination described by Buhl as “ chronic fatty metamorpho- 
sisf in which the alveolae project from the gelatinous infil¬ 
trated tissue as small, yellowish, opaque points. This differ¬ 
ence shows nothing more than that the fatty metamorphosis of 
the cells in the pulmonary alveolae of man takes place almost at 
one time, while by horses it results gradually. By this transfor¬ 
mation, there is present a fluid in the alveolae much resembling 
milk, and which may be pressed out of the alveolae. Microscopi¬ 
cal investigation demonstrates the presence of numerous granula¬ 
tion (molecules) in this fluid. This fluid is now resorbed, and 
air may again enter the alveolae, when chronic processes on the 
bronchi—bronchitis and peri-bronchitis—have not in the mean 
time taken place. Chronic bronchitis leads to sclerosis of the bron¬ 
chial parietes. The thickness of the parietes of the bronchioli is, ho w~ 
ever, so insignificant, that induration of the lungs can only take place 
when the surrounding connective tissue is at the same time com¬ 
plicated. This connective tissue encloses the bronchi, arteries’ 
and veins. It is the capsula communis, and the inflammatory 
processes taking place in the same is designated as peri-bronchitis 
fibrosa. Around the bronchi are formed thick, white masses 
