542 DISEASE IN WILD MAMMALS AND BIRDS 
to accident, or to abuse of old and less vigorous members 
of the colony. We are unable to give comparative exhibi- 
tion periods and death rates for monkeys in the large 
house and this open cage because some specimens have 
been changed from one to the other but it is certain that 
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Chart S. VERVET MONKEY (Cercopithecus lalandii). Tuberculous. 
the appearance of the '* band stand " monkeys is better 
than those in the house and there are four of eleven ani- 
mals in the former which have been there eleven years 
and only four among the seventy in the exhibition house 
for that length of time. 
The results of the foregoing work seem to demonstrate 
that the tuberculin test permits the separation of tubercu- 
lous and non-tuberculous monkeys and that its employ- 
ment serves the purpose of maintaining a healthy 
