110 
J. LAW. 
there is no governmental measure for stamping out, and it may 
be conjoined with the ordinary methods of extinction by slaughter 
without the danger of propagating the disease which always at¬ 
taches to ordinary inoculation. But with all the many advantages 
which I see in this my own system, I am convinced that the Gov¬ 
ernment can do incomparably better if it will. 
6th. Preventive Medication. —In my experience of this 
disease in Scotland, over 20 years ago, I found that a long course 
of certain tonics, and notably of the preparations of iron, forti¬ 
fied the system so that few animals fell victims to the contagion. 
But in this, as in the two methods named, the result is imperfect 
and the subjects soon reacquire the susceptibility after the tonic 
has been withdrawn. 
DestriLction of the Poison. 
1st. By disinfection of the air breathed. —In many instances 
of infected herds I have found that a thorough fumigation with 
sulphur fumes for half an hour at a time, twice or, better, three 
times a day, has at once put a stop to the further extension of the 
infection. The cattle already infected would still suffer ; but for 
the others the poison was destroyed soon after it entered the air- 
passages and before it could make its way into the tissues, and no 
disease resulted. Like the other methods named, this has its 
drawbacks. It requires suitable buildings and careful manipula¬ 
tion to secure a sufficient effect without danger to the animals, 
and as such frequent application is requisite it must be left in the 
hands of attendants, who cannot always be relied on to carry it 
out safely and effectively. 
2d. By Isolation , Slaughter and Disinfection. —Wherever the 
movement and intermingling of cattle can be prevented or 
sufficiently controlled, the method of suppression by isolation, 
slaughter and disinfection has ever been attended with the most 
perfect success. It has been insufficient in countries like Aus¬ 
tralia, where endless herds of cattle roam over the fenceless 
plains; but wherever lands could be enclosed and movement 
could be arrested or controlled, as in Norway, Sweden, Den¬ 
mark, Holstein, Oldenburg, Switzerland and Massachusetts, it 
