38 Report OF DEPARTMENT OF ANIMAL HUSBANDRY OF THE 
herds, the breaking down of a tuberculous animal was the first 
intimation that the disease had gained a foothold. 
Naturally the first question that arose was as to the state of 
health of the remaining animals. But two methods of determining 
their condition were available; the physical examination and the 
tuberculin test. Physical examination is a general method which 
is commonly applied to the diagnosis of many animal diseases. 
For the reason that dairymen are familiar with it and constantly 
using it in handling their cattle many of them are inclined to place 
more confidence in its results fhan in a method with which they 
have had practically no experience. In detecting the early stages 
of tuberculosis in cattle, physical examination is of little assistance 
because at this stage the disease is ordinarily located in the deep- 
lying glands entirely out of the range of observation. It is only 
when the disease has progressed to the point where considerable 
lung tissue is involved or some of the superficial glands are con- 
siderably enlarged that the tubercular condition may be readily 
detected. 
normal except for a tubercular area in each caudal lobe, the larger being 
on the left side. Heart and pleurae were normal. Many tubercles 4% to % 
inch in diameter scattered over the peritoneum. Capsule of the liver was 
dotted over with tubercles but the liver itself appeared to be normal. Uterus 
was infiltrated with tubercular tissue. The ovaries contained caseated 
masses, probably tubercular, in the center of each. The udder, which was 
considerably enlarged at the date of killing, was removed to the laboratory. 
Here it was cut into thin slices and carefully observed but no tubercles were 
found.” 
November 30, three rabbits were injected with material from Cow No. & 
One received a portion of the milk from the udder, a second received pus 
from an ovary while the third was injected with water in which two small 
tubercles from the uterus had been crushed. 
February 12 one of the rabbits died and the other two were killed. The 
autopsies in all cases showed well. marked tuberculosis. The lungs and 
diaphragm of all three were affected, in one case to such an extent as to 
make breathing difficult. In two cases the peritoneum was covered with 
modules while in the third case where the injecting needle had not reached 
the abdominal cavity there was a large fibrous mass with pus at its center. 
One or both kidneys in each of the rabbits contained tubercles. These 
results made it plain that not only was cow No. 8 suffering from tubercu- 
losis in an advanced stage but what was more alarming her milk contained 
virulent tubercle bacilli. This latter fact was especially interesting in view of 
the failure to find any tubercular lesions in the tissue of the udder even when 
it was cut into thin strips and carefully examined both by sight and touch. 
