MODERN VETERINARY PRACTICE. 
423 
breeders, especially, have changed very much during the past 
few years. When tuberculin first informed us that a serious 
percentage of highly bred cattle was tuberculous it naturally 
aroused the opposition of breeders and owners. But as it be¬ 
came more and more evident that their cattle were actually dis¬ 
eased and that tuberculin was an accurate test as to the presence 
or absence of the disease, the more intelligent breeders naturally 
came over, and it is now safe to say that there are comparatively 
few cattle breeders in the United States or Canada who do not 
believe that bovine tuberculosis is seriously prevalent and that 
tuberculin is an accurate diagnostic. It is becoming rather 
common for breeders to purchase stock subject to test or with 
certificate of test. It is no longer necessary to found a herd of 
pure bred stock with tuberculous animals, and it is possible with 
the aid of tuberculin to free a herd from this disease. In view 
of recent work that has been done in Denmark and Germany 
and by experimenters in this country, it is very evident that it 
is not only practical but possible to breed tuberculosis out of a 
herd. This is based upon the demonstrated fact that a very 
large percentage of healthy calves can be reared from tuber- 
berculous dams, providing the calves are removed from the 
mother soon after birth and reared upon the milk of healthy 
cows or upon the sterilized milk of the dams. It seems to be 
a fairly well demonstrated fact that tuberculous cows with dis¬ 
eased udders are apt to give infectious milk and that tuber¬ 
culous cows with apparently sound udders may give such milk. 
It is now quite generally recognized that dairymen should not 
be permitted to sell milk which comes from untested cows for 
any city food supply, although comparatively few cities are 
making the tuberculin test a condition for issuance of license. 
Minneapolis was the pioneer in this and deserves great credit. 
St. Paul has recently adopted an ordinance somewhat sim¬ 
ilar to the one in force in Minneapolis, and the work for that 
city will soon be well under way. 
Chicago papers are discussing the matter. The veterinar¬ 
ians and physicians of that city are planning a joint meeting in 
