34 STORRS AGRICULTURAL EXPERIMENT ‘STATION. 
tuberculous animals, acquired, in the course of a few weeks, 
plain infection of tuberculosis, while other control animals 
under the same conditions and fed upon sterilized milk have 
failed to develop the disease. 
The conclusion that milk is thus a possible source of in- 
fection is not confined simply to experimental evidence upon 
animals. Various facts in connection with the disease in man 
point in the same direction. Many cases have been instanced 
where persons have developed tuberculosis under circum- 
stances which point strongly to milk as a source. One well 
known example of this sort may serve as illustration. A 
boarding school in the city of Paris had fourteen girls, nine of 
whom were in the course of a few months taken with tubercu- 
losis. An investigation showed that they had all been using 
milk from one cow, and that that cow was markedly tuber- 
culous. The inference was that the milk of the animal had 
given rise to the disease in the girls. This is only one instance 
of which many others are known. Of course it must be recog- 
nized that such instances are not proofs, for it is possible that 
there was some other source of infection than milk. In all 
similar instances of human beings deriving tuberculosis from 
milk there is always a little lacking to a complete demonstra- 
tion. While the probabilities have always been that milk is 
the source of trouble, the matter is not accurately demon- 
strated, because of the impossibility of getting demonstrations 
in regard to so obscure a subject. There has been one recently 
reported instance which is somewhat closer to a demonstration. 
It is in the case of a man who had some tattooing performed 
on his arm and used milk for the purpose. After the tattooing 
there developed on the arm certain tuberculous swellings, 
which were plainly traced directly to the operation of tattooing. 
It was found that the animal from which the milk had been 
obtained was tuberculous, and the conclusion that this case of 
skin tuberculosis came from the milk is unquestionable. 
It is not necessary to dwell upon this side of the question 
longer, because the possibility of danger from the consumption 
of milk is too thoroughly recognized to require extended dis- 
cussion. It is the universal opinion in Europe and inthis 
country, of those who have looked into the matter, that there 
is a danger to mankind in the use of tuberculous milk. The 
question, however, of more importance, and the one in regard 
to which there has been recently a change in public Opinion, is 
as to the extent of this danger. It is possible that man obtains 
