140 
HAROLD C. ERNST. 
bacilli were found. There were, therefore, five out of twelve 
positive results, or 41.66 per cent. It should also be said that 
of those counted as negative three sets of specimens were 
suspicious, but were hastily examined for the purpose of this 
paper, so that a more careful search will very probably in¬ 
crease the percentage of successes. 
In the series of feeding experiments on one set of pigs, the 
milk being given to them from the same cows as before, there 
were seven pigs used in all, from one litter and healthy 
parents. Of these, examination showed negative results in 
two, positive results in two, one was subjected to a very hasty 
microscopic examination, and the material from two was 
thrown away—a mistake, as was shown by the results of the 
microscopic examination of the material from No. 3. There 
are to be counted, therefore, only five, giving as successful re- 
. suits 40 per cent. 
By the cover-glass examinations we have shown that the 
milk contains infectious material in ten cows out of thirty-five, 
from which the milk was examined for bacilli—that is, in 28.57 
per cent. We have also shown that the milk was infectious, 
by inoculation experiments, in seven out of fourteen of the 
cows from which the milk came—that is, 50 per cent. And 
we have shown the infectious nature of the milk by ocular 
demonstration and successful inoculation from the same spec¬ 
imens in five cows out of fourteen used—or, 35.7 per cent. 
These results are, to a certain extent, preliminary—that is 
to say, they are but part of the work upon this subject which 
is being done under the auspices of the Massachusetts Society 
for the Promotion of Agriculture. The work will not be 
completed, at any rate, until next year. 
Thev show, however: 
ist, and emphatically, that the milk from cows affected 
with tuberculosis in any part of the body may contain the 
virus of the disease. 
2d. That the virus is present whether there is disease of 
the udder or not. 
3d. That there is no ground for the assertion that there 
must be a lesion of the udder before the milk can contain the 
infection of tuberculosis. 
