THE COMMUNICABLE DISEASES 
545 
the same and adjoining cages are removed for retest 
and the enclosure scrubbed and disinfected. 
There is a source of tuberculosis upon the importance 
of which we can only speculate — the visitor. There were 
two isolated cases in animals which had passed the test 
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Chart V. WEEPER CEBUS (Cebus capucinus). Tuberculous. 
with unexceptionable charts, three and four months on ex- 
hibition ; curiously enough no other cases occurred in their 
cages. These we have laid to visitor infection since no 
previous exposure can be traced for the specimens and 
no secondary cases occurred. 
I can conclude this discussion of the tuberculin test 
and of the control of tuberculosis by its use, by mention- 
ing the possibilities for the solution of the problem in man. 
While the eradication of the disease cannot be accom- 
