THE COMMUNICABLE DISEASES 
537 
tis and degenerative bone disease has remained about the 
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Chart N. BLACK-HANDED SPIDER MONKEY (Ateles geoffroyi). Tuberculous. 
quarantine, they do not properly belong to the exhibition 
collection. Up to 1906 when the test technique was perfec- 
ted nearly all deaths were due to tuberculosis, the figure 
for 1906 (including experimental animals) being 78 per 
cent. However from February 1906 to October 1907 and 
from then until May 1910 no case of tuberculosis occurred 
in the exhibition cages and both deaths at these given 
times seem like infection from ^dsitors. During the next 
three years thirteen monkeys died of the disease in the ex- 
35 
