





TUBERCULOUS COWS AND THE USE OF THEIR MILK. 245 
ascribed to immunity to the tuberculin, as some animals failed 
to respond for several months and later did respond, while 
others have not responded for more than a year, although 
tested several times. 
The first test after the cows reached the Station was made 
by the College Veterinarian, Dr. George A. Waterman, Janu- 
ary 26-27, 1897. This was three months after the animals 
were condemned by the Cattle Commissioners. Adl four of the 
cows responded clearly to the test. In addition to the neces- 
sary rise of temperature to indicate the presence of the disease, 
cow No. 1337 showed a roughness of the hair at 9:30 A. M., 
the 27th, and Nos. 1341, 1343, and 1344 each showed a decided 
chill between 9:30 A. M. and 3:00 p.m. ‘The next two tuber- 
culin tests were made by the same veterinarian. ‘Three months 
later, April 26-27, all four of the cows were injected. At 
that time cows No. 1341 and 1344 responded to the test, 
while the other two cows showed no apparent results. None 
of the cows manifested any signs of chill. ‘The next test was 
made about four months later, July 30-31. At that time none 
of the cows gave any appreciable rise. of temperature nor 
did they manifest any physical symptoms, such as chilling or 
roughness of the hair. Late in September it was thought 
desirable to repeat the test, and as the College was temporarily 
without a Veterinarian, the services of Dr. L. J. Storrs were 
engaged. No response either in rise of temperature or physi- 
cal symptoms could be observed. 
The tuberculin tests which were made in December, 1897, 
and April, 1898, were conducted by Dr. N.S. Mayo, the present 
College Veterinarian. In these tests the temperatures before 
injection were taken every three hours throughout the day. 
As these varied but slightly only the averages for the day are 
given in the table. Inthe test made December 17-18, cow No. 
1344 gave a marked rise of temperature while the other three 
showed no response. The last test previous to the publishing 
of this Report was made April 11-12, 1898. At that time cow 
No. 1343 responded while the other three cows did not. Cow 
No. 1344 showed a slight rise of temperature at,4, 6, and 8 
Pp. M., the day after injection, but she was observed to be in 
heat at this time, a condition which would doubtless account 
for a slight abnormal temperature. 
