[47]

June 29- 1870 Expression

used

Two or 3 sp. of Macacus & some other monkeys & Cynopithecus niger when making their silent jabbering noise from pleasure at being caressed, closely depressed their ears, like a snarling dog, & this seems one chief cause why their expression of pleasure is not recognized by a stranger, whether there is any real connection between the muscles which retract the corners

[47v]

of the mouth & depress the ears I do not know, but the appearance was exactly as if both sets of muscles were necessarily moved together.

It will be eno' to say that some monkeys depress their ears when savage & that others erect them, & that I can give no explanation of this difference: some, as Sutton, remarked uncover the teeth when savage, & others do not.

[in margin:] whether this is related to depress of ears I know not

[Expression, p. 114.]