The Descent of Man

Journal of Natural History,' vol. iv. 1843-44, p.
383.) Rengger (38. 'Saugethiere von Paraguay,'
1830, s. 51-56.) easily taught an American monkey
thus to break open hard palm-nuts; and
afterwards of its own accord, it used stones to
open other kinds of nuts, as well as boxes. It
thus also removed the soft rind of fruit that had
a disagreeable flavour. Another monkey was
taught to open the lid of a large box with a
stick, and afterwards it used the stick as a lever
to move heavy bodies; and I have myself seen a
young orang put a stick into a crevice, slip his
hand to the other end, and use it in the proper
manner as a lever. The tamed elephants in India
are well known to break off branches of
trees and use them to drive away the flies; and
this same act has been observed in an elephant
in a state of nature. (39. The Indian Field,
March 4, 1871.) I have seen a young orang,
when she thought she was going to be whipped,
cover and protect herself with a blanket or
straw. In these several cases stones and sticks