174 
LEONARD PEARSON. 
but only after it has been heated to 185° F. In this way healthy 
herds are being developed from tuberculous ones and as the 
tuberculous cattle die or are killed for beef the reacting division 
of the herd becomes smaller and smaller until finally it has dis¬ 
appeared, and thus tuberculosis is being allowed to die a natural 
death. 
The Ctirability of Tuberculosis. —Occasionally tuberculosis 
becomes latent after an animal has reacted to tuberculin, the sub¬ 
ject improves in condition and fails to react upon subsequent in¬ 
jection, so that it may not be possible to confirm or reestablish 
the original diagnosis. This takes place most frequently in the 
cases that are less advanced, and some have thonght that such 
cases might be cured. In order to throw light on this question 
Professor Bang killed and made post-mortem examinations upon 
four animals of this sort, but found that they all had tuberculosis, 
and states that “ I therefore do not venture to draw from these 
observations the,conclusion that these animals that failed to 
react one year after a typical reaction are to be regarded as 
cured. In many cases this conclusion would perhaps be justifiable, 
but as it cannot always be the case I consider it advisable to look 
upon, animals that have once shown the typical reaction as sus¬ 
picious and to leave them in the reacting division.” 
Heredity. —The matter of inherited predisposition to tuber¬ 
culosis is considered and some doubt is thrown upon its influ¬ 
ence and even its existence, and there is no reason to assume 
“ that a calf whose sire or dam suffers from tuberculosis acci¬ 
dentally acquired has thereby inherited a predisposition for 
tuberculosis which offers a more favorable nutritive soil for the 
development of the germs of tuberculosis and the predisposition, 
however great it may be, can play no practical part if infection 
is avoided.” 
The Use of the Flesh of Tuberculous Anhnals. —Under 
proper inspection and certain restrictions and exceptions it 
seems to be quite possible to use the flesh of some tuberculous 
animals without danger, and such is the practice not only in 
Denmark but in all other European countries. Some carcasses 
