TUBERCULOSIS IN CATTLE: 49 
animals that are still valuable, they cease to find so many ob- 
jections to the use of the test, and gradually learn that it 1s 
decidedly for their advantage to have their herds tested in 
order that they may be on a better vantage ground to protect 
their herds for the future. The result 1s that in Europe the 
objections to the use of tubercylin have very largely disap- 
peared, and are disappearing now even more rapidly. If the 
legislation had not been too precipitate in early years and de- 
manded the indiscriminate slaughter of all reacting animals, 
it is doubtful whether any of the great opposition to the use of 
tuberculin would have developed. At the present time the use 
of tuberculin is coming to be made simply to detect the pres- 
ence of the disease, so as to give the farmer, in conjunction 
with the veterinarian, the data upon which he can successtully, 
and without too great inconvenience and too great expense, 
deal with the subject of tuberculosis and free his herds from 
this curse in the future. 
In general, then, the use of tuberculin is increasing, and its 
value is becoming every day more and more appreciated. It 
enables the farmer to pick out the animals which he must deal 
with as suffering from the disease, either in an incipient way 
or in a more advanced stage, and gives him a chance to battle 
with the disease in a successful manner. It is the one success- 
ful means of detecting the presence of the disease, but the 
veterinarian and the scientist are learning more and more 
clearly each year that it should not be used for detecting ani- 
mals for the purpose of indiscriminate slaughter. 
METHOD OF DEALING WITH THE TUBERCULOUS HERD. 
The next question is how the farmer can deal with a herd 
after tuberculosis has once obtained entrance to it without too 
great expense and with promise of successfully handling the 
problem. Every attempt to get rid of tuberculosis from the 
herd of cattle must begin with the tuberculin test. herests 
very little chance for the farmer to get rid of the disease after 
it is in his herd, except either by getting rid of all of his herd 
and starting absolutely new, or by beginning with the tuber- 
culin test and thus discovering every case of tuberculosis, even 
in the most incipient stage. Thus, and thus only, can he start 
‘in his attempt to purify his herd with a fair hope of success. 
After the tuberculous animals have once been designated in 
this way, the problem of what to do with them is still a se- 
