THE COMMUNICABLE DISEASES 
539 
tested every two years, a method which enabled us to catch 
a small group in 1916 and has protected the collection 
since then. Three of the six monkeys specified above were 
never placed free in the general cages of the exhibition 
house, they being segregated in smaller cages. One, the 
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Chart P. ORANG UTAN (Simia satyrus). Tuberculous. 
orang, was with its mate in an isolated cage. The other 
two were in larger cages and their history suggests visi- 
tor infections. 
We have never underestimated the possibility that 
an occasional very early case might evade detection by 
this test but we believe the history just outlined warrants 
us in depending upon it for the protection of the exhibi- 
tion. By the tuberculin test we have detected the existence 
of the disease in twenty-three per cent, of specimens. 
