
TUBERCULOUS COWS AND USE OF THEIR MILK. 167 
period of ten months. Two others were in the same stable with 
the cows for periods of from three to six months, after feeding tests 
of ten and twelve months were ended, before showing any indica- 
tions of the disease. These tests would seem to show that as the 
disease in the cows becomes advanced the milk becomes more infec- 
tious, and that there ts great danger to the health of other animals, 
both from the use of the milk and by association with the diseased 
animals, 
The results of these experiments coincide with the general results 
of European observations, and indicate that the danger from the 
spread of tuberculosis through the milk of cows to other animals 
zs not as great as has often been supposed. In the earlier stages 
of the disease, and at all times when the udder ts not affected, the 
danger from the use of the milk thus appears to be quite limited. 
Great stress, however, should be laid on the danger of using as 
food for man or animals milk from cows which show any symp- 
toms of udder affection, or when the disease ts so far advanced in 
the cows as to be indicated by outward signs or other marked 
physical symptoms. 
