538 DISEASE IN WILD MAMMALS AND BIRDS 
hibition and many more in quarantine. By 1913 the out- 
break was stamped out. Its explanation is not so veiy far 
to seek. In the fall of 1910 we obtained some suspected 
monkeys which were kept in one of the quarantine rooms. 
After repeated testing two were passed. From them five 
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Chabt O. rhesus macaque (Macacus rhesus). Tuberculous. 
cases are known to have originated and it was not until in 
1912 when the whole exhibition house was cleaned of speci- 
mens, thoroughly disinfected and fumigated and until 
every specimen was retested, that the infection passed. 
In 1914 no cases occurred, while in 1915 a case either 
slipped through undetected or was a visitor infection; 
1916 two cases, 1917 one case, 1918 one case (see orang- 
utan charts), 1919 and 1920 none and 1921 one case, 1922 
no cases. Since 1912 the whole monkey collection has been 
