THE PREVENTION OF TUBERCULOSIS. 
309 
scale either. The herd consisted of two hundred and eight 
(208) cows of the red Danish breed, besides bulls, heifers and 
calves. By the tuberculin test it was found that eighty (80) 
per cent, of the cows, forty (40) per cent, of the bulls and 
foity (40) per cent, of the heifers and calves were diseased. 
Aftei a careful disinfection, the diseased and the presumably 
healthy animals were put at opposite ends of the stable and 
a wooden partition erected between them. This was done in 
1892, and since then the healthy part of the herd has been 
tested every six months—in all, four times. By the second 
test ten (10) per cent, reacted and were at once put with the 
originally diseased part of the herd; six months later they 
were again tested and only one (1) animal in one hundred 
and seven (107) reacted, while six months later the test re¬ 
vealed only two (2) animals in one hundred and twenty-two 
(122) suspected of tuberculosis. The calves from the dis¬ 
eased cows were, as soon as born, taken and put with the 
healthy part of the herd. The milk from the diseased cows 
was used for rearing the calves, but before being fed to them 
it was heated to a temperature of sixty-five (65°) centigrade. 
He concludes by saying : 
“It therefore seems to me to be demonstrated that it is 
possible to rear a healthy herd on a farm where there is an 
infected herd, the two being separated by a wooden par¬ 
tition, and that this will prove successful even when the 
calves from diseased cows are reared.” 
Professor Bang thinks the reason that ten per cent, among 
the presumably healthy animals were six months later found 
to be diseased was because the separation between the two 
poitions of the stable must have been incomplete. I am in¬ 
clined to think that in this he is probably in error. In all 
likelihood the animals were diseased at the time of the first 
test but required a second test to develop the reaction. 
Among diseased cattle there are always some that do not 
react to a first test, and the number which do not react is 
very nearly eight (8) per cent. Consequently, the fact that 
he found a number more on the second and third tests is 
readily understood and in no way invalidates the fact that 
