EXPERIMENTS WITH TUBERCULOUS COWS. LO 
In the earlier feeding tests with the milk of the diseased 
cows the calves were kept in the same stable with the cows, 
one object of these experiments being to study the infectious- 
ness of the disease when the calves were associated with the 
cows while being fed their milk. The results of the first two 
years’ feeding tests show that, while the milk of each of the four 
cows was fed to separate calves in periods ranging, in the dif- 
ferent cases, from three months to one year and four months, 
in no case was there any indications of the disease in the 
calves during the feeding period. The calves were kept with 
the cows nearly two years. One of these calves responded to 
the tuberculin test about five months after the feeding period 
of sixteen months was ended, and was found upon post mor- 
tem examination to be very slightly diseased. These results 
would seem to indicate that while the cow has the disease in its 
earlier stages, and if the udder is not affected, the danger of 
the spread of the disease 1s limited. 
During the laté summer and early fall of 1898, three of the 
four cows produced calves, and it was decided to feed their 
milk to their offsprings. The offspring of one cow (1341) and 
the offspring of a tuberculous cow from another herd were 
selected for a comparison of the infectiousness of pasteurized 
and raw milk from the same cow. About half the milk from 
one cow was heated to about 170° F. and fed to her offspring, 
and the balance of the milk, in its natural state, was fed to 
the offspring of the other tuberculous cow. ‘The calves were 
isolated from the cows, being kept in the main part of the 
barn, while the cows were kept in the basement. Neither of 
the calves responded to the tuberculin test made after a feed- 
ing period of about ten months. By a misunderstanding both 
of the calves were fed the unpasteurized milk of the cow for a 
period of three weeks (following the tuberculin test) after 
which they were turned out to pasture for about five months. 
‘Three weeks after being returned to the stable with the cows 
the calf which had been fed the pasteurized milk (except for 
three weeks) responded to the tuberculin test, while the other 
calf failed to respond until some five months later. The con- 
ditions of this test would seem to show that the calf which had 
been fed pasteurized milk acquired the germs of the disease 
