452 
J. F. WINCHESTER. 
In all the various forms and seats of the disease, the bacillus, 
may be found in the affected parts. When the lungs are in¬ 
volved in the chronic forms, and the amount of the tissue is not 
extensive, the animal often presents the general appearance of 
health with, perhaps, the exception of a slight cough. The 
diagnosis of such cases by the ordinary physical method, will, 
as a rule, give negative returns, and suspicion only can be 
attached to such a case if associated with tuberculous animals. 
When the lungs become very extensively involved, the symp¬ 
toms are more distinct and reliable than the general appearance 
of the animal will assist. The fact that the lung in tuberculosis 
consolidates in patches with intervening spaces of normal tissues, 
will aid one to differentiate from many other forms of lung 
trouble. In the bovine race, when a certain part of the lung it 
diseased, and that by any means not slight, while at a point 
beyond that necessary for the required oxidation of the blood, 
they will fail; the same clinical fact is seen when the pleura is 
extensively diseased. 
The diagnosis of this disease in the digestive tract is impos¬ 
sible in the early stages by the usual method, and it is only 
when emaciated, diarrhoea, constipation and periodic attacks of 
hoven occur, that one might be justified in condemning the 
animal if there are no other associated symptoms. 
Occasionally one will see a bovine with chronic hoven and, 
if associated with tuberculosis, the post-mortem will often reveal 
an enlargement of the lymphatics at the cardiac portion of the 
oesophagus, posterior to the diaphragm. 
The differential diagnosis of the diseases of the udder is very 
essential, for it is frequently tuberculous. When simple mastitis 
is present, you will find diffused swelling of the quarter affected, 
which is hot and painful to the touch, the milk changes in its 
physical appearance, and as a rule it responds quickly to treat¬ 
ment. When the udder is tuberculous, the swelling is hard and 
nodulated, and as has been well said, it feels as though it was. 
full of kernals and seeds, well defined; it is neither hot nor pain¬ 
ful, nor does the mdk change in a marked degree, although in 
