There is, however, something strange about this case, for two specimens
subsequently kept in the Gardens, and believed to be the same species,
have never been seen to weep, though they were carefully observed
by the keeper and myself when much distressed and loudly screaming.
Rengger states[12] that the eyes of the _Cebus azarae_ fill
with tears, but not sufficiently to overflow, when it is prevented
getting some much desired object, or is much frightened.
Humboldt also asserts that the eyes of the _Callithrix sciureus_
"instantly fill with tears when it is seized with fear;"
but when this pretty little monkey in the Zoological Gardens
was teased, so as to cry out loudly, this did not occur.
I do not, however, wish to throw the least doubt on the accuracy
of Humboldt's statement.
The appearance of dejection in young orangs and chimpanzees, when out
of health, is as plain and almost as pathetic as in the case of our children.
This state of mind and body is shown by their listless movements,
fallen countenances, dull eyes, and changed complexion.
[12] Rengger, ibid. s. 46. Humboldt, `Personal Narrative, Eng. translat.
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