646 DISEASE IN WILD MAMMALS AND BIRDS 
connection the questions arising are, first, whether the 
infestment is a menace to life, and second, whether it is 
existent outside the Garden or only acquired here. The 
following lists set forth the parasitic status as shown at 
autopsy. The figures indicate how long the animal lived 
in the Garden : 
Marmosets 
Squirrel Monkeys 
Infested 
Not infested 
Infested 
Not infested 
1 day 
6-15 days 
4 animals) 
2 days 
3 months 
1 dav 
2 months 
1 month 
6 animals) 
14 days 
3 months 
6 months 
3-5 months ( 
9 animals) 
26 months 
5 months 
12 months 
6 months 
2 animals) 
14 months 
12 months 
7 months 
2 animals) 
15 months 
12 months 
8 months 
1 animal) 
13 months 
9 months 
10 months 
12 months 
14 months 
15 months 
17 months 
18 months 
20 months 
21 months 
2 animals) 
1 animal) 
1 animal) 
1 animal) 
1 animal) 
' 1 animal) 
2 animals) 
1 animal) 
' 1 animal) 
Totals 
8 animals 
35 animals 
3 animals 
5 animals 
Reverting to the questions above raised, the data show 
that some of the animals were certainly infested on 
arrival here, and that others probably were; but since 
these animals were not examined for parasites on arrival 
in the Garden the duration of infestment remains 
unknown, and accordingly we are not justified in going 
farther in our conclusions. In the case of the marmosets, 
though, if we confine ourselves to the non-parasitized 
animals, it would appear that the "acclimatization" 
period is within the first six months. I have attempted 
to arrive at a conclusion on this basis, but the average 
lifetime of the four parasitized marmosets which survived 
this period is the same as that of the sixteen non-para- 
sitized survivors, and we do not know at what time the 
parasitized ones contracted the disease. 
