MILK FROM TUBERCULOUS COWS. 
139 
the Saunders cow once in guinea-pigs, and twice in rabbits (two 
different specimens); and from the Mayhew cow three times 
in guinea-pigs (two different specimens)—that is to say, out 
of fourteen cows used the milk was shown to be infectious in 
seven, or 50 per cent, by inoculation experiments. 
An interesting fact is also shown, and that is, that bacilli 
were found in the milk or cream, and successful inoculation ex- 
perimens made in animals with the same specimen in five dif¬ 
ferent cases (including eight of the successful ones) as follows : 
Comparison of the dates when Bacilli were found in the Milk and the same Milk was used 
for successful imoculation experiments. 
Cow. 
Positive. 
Positive. 
Cover-glass. 
Guinea-pig. 
P. 
Cream, A. M. 
Cream, A. M., March 9, 1889. 
Cream, p. H. 
(Cream, p. M., March 9,1889. 
(Cream, p. M., March 9, 1889. 
0. 
1st of milking, cream, 
First of milking, cream, 
March 9, 1889. 
March 9, 1889. 
Slocum. 
Last of milking. 
Last of milking. 
June 10,1889. 
Mayhew. 
Last of milking, milk, 
Last of milking, milk. 
June 21, 1889. 
Positive. 
Rabbit. 
Cream, a. m., March 9,1889. 
Cream, p. m., March 9,1889 
The inoculation experiments above detailed seem to me 
to be deserving of consideration because they were done 
under the most careful precautions that could be devised. In 
all cases the experiment animals were kept under observation 
long enough to determine, so far as could be seen, that they 
were in good health, and after the inoculations they were sep¬ 
arated and kept under close watch, but in healthy surround¬ 
ings. Some of those that were used were inoculated imme¬ 
diately after purchase, because of a scarcity of the supply at 
the farm, and were not in good condition. But as no sign of 
tuberculosis appeared in any of these, their ill health cannot 
come in as a disturbing factor in the results. 
The results obtained from certain feeding experiments 
with calves show that there were thirteen calves used, and fed 
for varying lengths of time with milk from cows affected with 
tuberculosis, but not of the udder. Of these, the material 
was thrown away from one before the microscopic examina¬ 
tion, and this should be rejected in the final results. Of the 
remainder, there were five positive results obtained and one 
suspicious. The latter is counted as negative, for the reason 
that, although giant cells and granulation tissue were seen, no 
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