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more resistant was able to overcome the infection. The amount in- 
oculated, less than 2 cubic centimeters of milk, is a very small portion 
of a pint bottle. The creamy layer was not inoculated and other 
workers have shown that tubercle bacilli are more frequent in this 
than in the bottom milk ; it is very probable that if more animals had 
been inoculated with the same sample and both cream and sediment 
used the percentage of positive results would have been very much 
higher. The results, however, as they were found are sufficiently 
high to emphasize the great necessity for the enactment and rigorous 
enforcement of a law requiring that all cows supplying milk to the 
District be tuberculin tested and free of tuberculosis. This test, which 
is now universally recognized as a means of determining whether an 
animal has tuberculosis, should be made by a competent veterinarian 
and those animals that respond should be disposed of in some way so 
that their milk may no longer be a source of danger to the community. 
