TUBERCULOSIS IN CATTLE. 55 
The process is, of course, slow. A quicker way would doubt- 
less be to kill at once all the reacting animals. But the merit 
of the method of Prof. Bang is that it is done at an expense so 
small as to be hardly worth consideration. 
The success of this method as adopted by Prof. Bang in 
Copenhagen has been so great as to excite general interest 
all over Europe. Many of the bacteriologists and veterinari- 
ans of European countries have visited Copenhagen for the 
purpose of seeing the method actually in operation, and all of 
them come back with the belief that the method thus developed 
_is the only one that is practical and which bids fair to be a 
means of successfully combating this disease. At the present 
time this method is being recommended almost universally 
in European countries. Illustrative experiments are being 
started in other countries for the purpose of showing the 
farmers by demonstration how the method works. The ex- 
penses of the inoculation are in general borne by the public 
funds, and not by the farmer, and it is a rapidly growing be- 
lief that this method as devised by Prof. Bang is practical, and 
if applied with wisdom will enable our farmers to handle the 
subject in such a way as to rid their herds at least in large 
measure of the disease without any great expense to them, 
and with a minimum of trouble. : 7 
In these experiments it has been found, not unnaturally, 
that there has been greater success with young farmers than 
with older ones. The young farmer is more open to convic- 
tion of the value of the method, more ready to learn ‘methods 
and applies them with stricter accuracy. The older farmer 
cannot so easily be taught new methods. As a result the 
young farmer will almost always succeed in improving the 
condition of his herd in this way, while the older farmer has 
less success. It has been abundantly shown, however, that 
eternal vigilance is absolutely necessary. If the farmer be- 
comes careless, the whole procedure becomes useless, half-way 
methods being as good as none. 3 
The best method of introducing this procedure among 
farmers is, perhaps, not as yet definitely settled in different 
countries. It seems to be a general belief that the adoption of 
_ this method of Prof. Bang must be at first voluntary on the 
part of the farmers who are interested in the subject. If it 
was made compulsory it would be a failure. It can only suc- 
ceed where the farmer has interest enough to lead him to adopt 
and carry out strictly the rules for isolation given him. If it 
