28 
PART II. 
Tuberculosis. 
The quarantine rooms contained four monkeys await- 
ing retest at the end of the 1920 report period. 79 
monkeys remained in the collection. Twenty new mon- 
keys were received, four by birth which were not tested. 
94 tuberculin tests were made, it being the year when 
all monkeys in the Garden are retested. None of the 
specimens in the old collection showed tuberculosis al- 
though 15 had to be retested and seven of these passed 
to separate cages. Amongst the new arrivals two mon- 
keys gave such suspicious charts that they were killed, 
one showing tuberculosis at autopsy, the other failing 
to do so. At the end of the year no monkeys are being 
held. 
There has been no tuberculosis in the exhibition cages 
since August 18, 1918, when the Orang Silvia" died 
and with this exception none for 57 months. 
Tuberculosis amongst the other animals is less than 
last year, 30 as against 37, the higher place being taken 
as usual by Aves. Indeed, the only mammal in the col- 
lection to have tuberculosis was the old buffalo. This 
disease affected 29 birds, 22 in the Bird House and seven 
outside of it, and occurred in the following orders: Galli, 
8; Anseres, 5; Passeres, 5; Columbae, 3; Picarise 3; 
Accipitres, 2; Psittaci, Hemipodii, Alectorides, each one. 
There are 113 cages in the main house and 22 cases oc- 
curred in them. In 1920 14 cages were involved and 
eight of these cages were involved this year, showing a 
sterilization of only six. Four cages not containing 
tuberculous birds in 1920 were found infected this year. 
Mould disease was rather important during the summer 
and fall but has lately dropped off quite materially. 
Twelve birds died of this disease, 10 in the new house 
