670 
J. LAW. 
remaining. A professional examination of the most searching 
kind must be supplemented by the “tuberculin” test, before a 
clean bill of health can be furnished. In my own experience 
on cattle, two-thirds of the cases of tuberculosis sometimes 
escaped under the most critical professional examination, and 
were detected later by the “tuberculin” test. Often when cat¬ 
tle were condemned by the “tuberculin” test have the owners 
pronounced them the most thrifty and the least suspected in the 
herd, and it has only been after slaughter, when the bodies 
were opened and the old caseated tubercles exposed, that they 
were satisfied that no mistake had been made. Recently in a 
herd kept for the supply of milk of guaranteed soundness, the 
stock having been subjected to weekly examinations by a vete¬ 
rinarian, the “tuberculin” test was applied, and 50 per cent, of 
the herd demonstrated to be tuberculous. Without the “tuber¬ 
culin” test there is no guarantee possible for the products of 
the dairy, and the sanitary officers who will affect to deal with 
this disease in herds without the aid of “tuberculin” are at best 
but pruning the tips of the branches of the evil tree. Public 
money ought not to be thrown away on such fruitless and in¬ 
effective work. 
The purification of a herd must be followed in every case 
by a thorough disinfection of contaminated buildings and places 
and by a careful seclusion of the herd from new sources of in¬ 
fection. It is evident, therefore, that the non-tuberculous herd 
must be secured against the addition of fresh animals from any 
herd that has not been similarly attested sound, and that any 
necessary addition from another source, must be tested by “tu¬ 
berculin” before it is added to the herd. Equally important is 
it to test all farm animals of whatever species,, which live on 
the place and co-habit with the herd, and to see to it that no 
human being suffering from tuberculosis is allowed to attend on 
the animals nor to prepare their food. It is difficult to see how 
anything short of such a system can afford a guarantee of the 
absence of the soluble tubercle poisons from our milk, butter 
and cheese. 
