SPORAEIC PNEUMONIA AND CONTAGIOUS PLEURO-PNEUMONIA. 533 
section are observed, principally towards the lower border, a 
great number of yellowish points close together; these are very 
small purulent centres, enclosed in the hepatized tissue. By 
pressure, these centres empty themselves of their contents, which 
proves to be a few drops of yellow, thick, creamy pus. Low 
down the lobe, these collect together by hypothasis, become more 
apparent, and form very irregular but larger purulent masses ; 
their substance, partly concreted, allow them to keep the form of 
their cavities, from which rise the numerous prolongations that 
they present, and render them comparable to the moulding of the 
pulmonary acini. 
In this region there is another lesion ; it is the ultimate trans¬ 
formation of the lobules, already mentioned, in the middle and 
upper regions as disorganized by hemorrhage; too extensively 
diseased to return to a healthy condition of life, they are slowly 
disjointed from the surrounding divisions and form a sequestrum, 
moving in its alveola, whose tissue, more friable and discolored 
than that of the hepatized lobes, is in way of softening. Even 
at times, the blood having entirely dried and being resorbed, there 
remains but the primitive tissue desagregated by the hemorrhage, 
under the form of more or less solid masses. 
Divided, the bronchia present alterations varying according 
to the region ; in the middle and upper one they are filled with 
whitish very foaming serosity, the mucous membrane, highly in¬ 
jected, has a color varying from saffron yellow to mahogany. 
In the lower part the serosity which they contain is less foam- • 
ing, has become purulent, half concreted, and the mucous mem¬ 
brane seems to be destroyed. 
The bronchial lymphatic glands are hypertrophied, and on 
section shows extensive injection. Their color is brownish grey. 
DIFFERENTIAL LESIONS. 
It being granted that pleuro-pnemnonia is a specific affection, 
transmissible, of an exudative nature, becoming inflammatory only 
secondarily, with an incubative stage and with a very irregular 
mode of progress : 
Again, being admitted that the sporadic disease is a true, irri- 
