530 
COULON AND OLIVIER. 
All these are missing in the sporadic form, animals preserving 
even to an advanced period a certain amount of appetite. 
A third differential diagnostic character is the complaint or 
grunting which shows itself from the beginning in pleuro-pneu- 
rrionia, and of which it is for many the pathognomical symptom. 
It is, on the contrary, exceptional in sporadic pneumonia, and 
when heard there, it is only by intermittence and when the dis¬ 
ease assumes a rapid and severe form. 
The tubular breathing is also a good symptom ; seldom hear 
in the sporadic affection, it is, on the contrary, frequent in pleuro¬ 
pneumonia. In that disease, when the pleura becomes well dis¬ 
eased, the chest shows evidence of an exaggerated sensibility; in 
the true pneumonia, where the pleura remains intact, percussion 
is apparently painless. 
And again, the cedematous infiltration of the dewlap is a very 
important differential symptom, as it never exists in the sporadic 
disease. 
To resume : Sporadic pneumonia differs from the contagious 
affection by— 
1st. A gradual increase of the temperature, reaching its 
highest degree only in the second stage. 
2d. By the absence of all digestive trouble in the course of 
the disease, and principally at the first stage. 
3d. By the manifest insensibility of the chest. 
4th. By the ordinary absence of the grunt and of the tubular 
breathing, which is never missing in pleuro-pneumonia. 
5th and last. By constant absence of the swelling of the 
dewlap, which generally exists in pleuro-pneumonia. 
LESIONS OF SPORADIC PNEUMONIA. 
On the opening of the chest there is no effusion in the pleural 
cavity. There are no adhesions between the pleura, except when 
little superficial abscesses of the lung have pushed out and irri¬ 
tated the visceral and produced its adhesion to the costal layer. 
With this exception, the serous remains transparent, smooth and 
soft, as in the normal state. 
The lung fills up the chest exactly ; does not collapse to the 
