120 
showed them to be affected with tuberculosis, two to such an ex- 
tent that the carcasses were condemned. On December 12th the 
three remaining reactors were submitted to the intra-dermal test, 
being used as checks on a number of small Japanese herds which 
were injected at the same time and in the same manner, all re- 
ceiving intra-dermal tuberculin (O. T. Ser. Dil. No. 5) from the 
same package. While the Japanese cows, all of which were either 
fresh or else had passed the subcutaneous test failed to show any 
reaction, the three previous reactors of F. C.'s all showed large 
topical swellings indicative of the presence of tuberculosis. F. 
C.'s remaining herd, which in the meantime had been replenished! 
with ear tagged (healthy) animals to the number of 26, was sub- 
mitted to the intra-dermal test on February 14th with the result 
that all the 26 passed, which demonstrated that the segregation 
and disinfection of the premises had been effective. It may be 
added that F. C.'s dairy premises rank among the best in the city. 
In contrast to this case may be quoted the herd of J. P. M. 
On July 5 to 6 last year this herd consisting of 14 cows was sub- 
mitted to the subcutaneous test with the result that 9 passed and 
5 reacted. When on March 8 of this year the herd then consist- 
ing of 12 animals was given the intra-dermal test there still re- 
mained on the premises 3 of the previous reactors, not segregated. 
The result was that 3 of the previously passed cows gave typical 
reaction, leaving 6 reactors and 6 passed as compared to 3 re- 
actors and 9 passed. This case illustrates the rapid spread of the 
disease where no effort to segregate the reacting animals is made. 
A similar case is that of A. P. who on June 29 to 30 had his herd 
of 12 cows and 1 bull tested subcutaneously, one cow reacting. 
This cow was allowed to remain on the premises as a result of 
which the intra-dermal test, when applied to the herd on March 
7 of this year, showed that the bull, as well as the same cow, 
which was injected as a check, gave reaction. This time the 
owner did not lose any time in disposing of the reactors, and it 
must be admitted that he was convinced to such an extent as to 
favorably influence several of his compatriots in the milk busi- 
ness to go and do likewise. Another herd, consisting of six cows 
and tested by the old method of July 14-15 last, giving one re- 
actor, which was allowed to remain with the others, gave, when 
tested by the new method two reactors, one being the previously 
condemned one. 
In only two cases where previous reactors were admitted as 
checks did they fail to respond to the intra-dermal test. One was 
a very fine fat cow giving 18 to 20 quarts, and being the only 
reactor in a herd of 13 animals. When retested by the new 
method on February 13th this year, being admitted to the test as 
a check, it gave no reaction. This animal must therefore be con- 
sidered as a past reactor, which, however, does not mean, that 
there are no tuberculous centers or foci in the sy^em. It simply 
means that there is a temporary but not likely a permanent cessa- 
tion of activity on the part of the infection, with possible encap- 
sulation of the affected area, but the failure to react this time 
