SPORADIC PNEUMONIA AND CONTAGIOUS PLEURO-PNEUMONIA. 535 
This hypertrophy of the divisions make them appear as if they 
predominated over the pulmonary texture, and on section they 
form a greyish white surface, over which the lobules show the 
multicolor aspect. 
An incision through the sporadic lung shows, on the contrary, 
that the disease extends to the entire lobe; the lesions are quite 
regularly superposed from below upwards, and the various shades 
of the general coloration are sensibly mingling together ; the 
brown or purplish color of the middle region becomes of a strong 
and then a pale red, as it goes towards the superior part of the 
lobe; it becomes of dark brick red coloration as it goes down, 
and towards the inferior border resembles boiled meat. 
The interlobular septa, which we have seen infiltrated in strong 
yellow, and surrounding the congested centres of pleuro-pneu- 
monia, are, on the contrary, here, in the congested region, infil¬ 
trated with a blackish bloody serum ; their thickuess is small. 
The infiltration being consecutive to the congestion of the lobules, 
these prevent their enlargement. In the inferior region, which is 
hepatized, and where they are compressed by the densified paren¬ 
chyma, they resemble little regular whitish lines of small thickness. 
In pleuro-pneumonia, the disease process being most exclu¬ 
sively confined to the connective tissue, gives rise to an excessive 
proliferation of its elements, hence a condensing irritation, an in¬ 
duration gradually and continually increasing. 
The examination of the lobules made separately, shows, indeed, 
that their lesions are all due to the compression and crushing to 
which they are subjected by the septa, and from which rise so 
many lobular pneumonia. But as the pulmonary structure is not 
primarily affected, there is no true hepatization, and as the con¬ 
gestion succeeds immediately an induration, complete and defini¬ 
tive, red first, and then whitish. 
In ordinary pneumonia, the initial lesion starts, on the con¬ 
trary, in the mucous membrane, its irritation starts the inflamma¬ 
tory congestion, then the general hepatization of the lobe, 
traduced by a condition of friability more or less marked, and 
finally by its purulent transformation—conditions which do not 
take place in pleuro-pneumonia. 
