888 
J. V. LADDEY. 
thoracic wall with lesions also not far advanced. It also shows 
the relative density of the shadow cast by the portion of the 
rib and the tubercular deposits. 
PHOTOGRAPH NO. 2. 
Tubercular Abscess of Lung:. 
The radiographs showing such satisfactory results, I pro¬ 
ceeded to make arrangements for a fluoroscopic examination on 
the living animal. The examination was made in a dark booth 
erected for the purpose, with a 12-plate static machine to gen¬ 
erate the electrical current. The examination was made on 
both sides of the animal; an assistant manipulated the Crookes’ 
tube on one side of the animal, so as to have it directly oppo¬ 
site the fluoroscope through which the cow was examined on 
the opposite side. 
For the first examination the subjects were four thin cows, 
which were selected because they were thought to be of a tuber- 
