54 STORRS AGRICULTURAL EXPERIMENT STATION. 
as the size of the two herds of healthful and reacting animals 
change. It has been found necessary each year to move the 
partition in such a way as to make the reacting herd smaller 
and smaller, while the healthy herd is larger and larger. 
The results are shown in the following table: 



No. of animals in re- . No. re-acting in the 
Year. acting herd. No. in sound herd. sound division. 
| 
DOO he sc. xos meh Tf Sey as 
i ys 80 12 Glen Jaa go 103 | 10 
PEOAL pee. 81 122 2 
PSOne eit | 69 136 3 
T5060 > oe 54 149 a 
EBOT sees 48 155 6 




_ It will be seen that while the number of the reacting herd 
has decreased from 131 to 48, that of the sound herd has in- 
creased from 77 to 155. It will be seen also that each year a 
few of the animals left in the sound herd become infected, but 
that the number is small. Evidently this herd is slowly getting 
rid of the disease. | 
The same method has been adopted quite widely in the 
dairy herds in Denmark, and the results in general have been 
similar to those obtained under the personal direction of Prof. 
Bang. But they have not been universally successful. In 
some cases the decrease in the reacting animals has been very 
slow, in other cases it has been hardly noticeable. In most of 
the herds, however, it has been possible to show that the cause 
has been the fact that the farmer has failed to obey the direc- 
tions for careful isolation; that in some way, either by having 
the door in the partition between the two stalls, or by having 
the same attendants, or by some other means, there has been 
communication between the reacting herd and the healthful 
herd. Under these circumstances the disease has been carried 
from the one to the other and the healthful herd has, therefore, 
been constantly infected. It is certainly a fact that even under 
the best circumstances new cases of tuberculosis occasionally 
occur in the reacting herd, indicating, of course, some source 
of contamination either from the other animals or from the 
attendants. But in spite of this partial failure the method has 
been in general very successful, and is apparently now in such 
successful operation in many places in Denmark that the 
farmers are slowly getting rid of tuberculosis from their herd. 
