NOCARDIOSIS Q75 
growing out into the medium giving an arborescent, translucent zone 
about each colony. Gelatin is liquefied. 
Morbid anatomy. The knowledge of the morbid anatomy is 
confined to the cases described by Burnett. For assistance in dif- 
ferentiating lung lesions in cattle the following quotation is taken 
from Burnett’s report. 
“Principal lobes of the lungs are not collapsed, ventral and cephalic 
ones are partially collapsed. On the surface of the principal lobes 
of both lungs are several depressed scars with radiating depressions. 
The surface of the lungs is mottled with areas lof a greyish color 
Fig. 64. SURFACE OF LUNG, COW, SHOWING DEPRESSED SCARS, AND RADIATING LINES. 
ABOUT ONE-HALF NATURAL SIZE (Burnett). 
involving from one to several (6-12) lobules, with areas of normal lung 
in which the interlobular tissue is emphysematous, and with areas 
varying from 2.5 to 7 cm. in thickness in which the interlobular tissue 
is very much thickened as indicated by streaks of greyish fibrous 
‘tissue. 
“The lungs throughout are sprinkled with firm nodules varying 
from 2 to 15 mm. in diameter. There are several areas in which these 
nodular masses are coalescent, giving firm masses from 3 to 7 cm. in 
diameter. These exist near the surface and within the tissue of the 
lung. Upon section the smaller nodules are greyish in color and 
