Tuberculosis 385 
it gradually subsides. While the testing by tuber- 
eulin is not a difficult task, it is usually economy to 
employ some one who has had some experience, and 
who can give due consideration to the various in- 
_fluences that modify the reaction. Cattle should not 
be tested too frequently with tuberculin, as the system 
acquires a tolerance and does not respond accurately. 
One test yearly, or not oftener than once in six months, 
is usually efficient. 
In testing cattle, the animals should be disturbed as 
little as possible. They should be given small quanti- 
ties of water frequently, but not turned out and allowed 
to drink large quantities, as this is liable to cause a 
sudden fall of temperature. 
Tuberculin is not infallible. In some eases, espe- 
cially when the animal is badly diseased, it fails to 
cause a rise of temperature, aud in a few cases it causes 
a rise of temperature in healthy animals; but the per- 
centage of the errors is very small, and at the present 
time tuberculin is the most effective means known for 
detecting tuberculosis in animals. The subcutaneous 
injection of mallein seems to be the best method. 
After a herd has been tested and all tuberculous 
animals have been removed, the barns and stables 
should be thoroughly cleaned and disinfected before 
other cattle are put in. No animals should be ad- 
mitted to a healthy herd until they have been tested 
and found to be free from this disease. 
In Denmark, the following plan for eradication of 
tuberculosis, called the Bang method, has been tried with 
success. All cattle are tested with tuberculin, and inose 
Y 
