keys would have succeeded ultimately in solving
the problem of obtaining the food had they been left in the cage with a
number of boxes, for Skirrl very early indicated interest in moving the
boxes about, and Sobke showed a tendency in that direction which perhaps
was inhibited partially by his distrust of the experimenter.

_Draw-in Experiment_

For Sobke, as for Julius and Skirrl, the draw-in test was made by
putting food on a shelf outside the cage, beyond the reach of the
animal, and placing in the cage with the animal one or two sticks long
enough to be used for drawing in the bait.

Sobke was first given this test on July 24. He tried persistently to
reach the banana with his hand, seized the box which supported the bait,
shook it, picked up one or other of the sticks, and chewed at it
repeatedly, but not once did he make any move to use a stick to draw the
food toward him.

This experiment was repeated on July 27, 29, 30 and 31, a period of
thirty minutes being allowed on each day for observation. At no time did
Sobke show any inclination to use either a stick or any other object as
a means of reaching the bait. Instead, he confined himself strictly to
the use of hands and teeth.

This test makes it fairly certain that Sobke had no natural tendency to
use objects as tools. In so far as he attended to things about the cage
or laboratory, it seemed to be rather to play with them in a general way
than to use them ideationally or otherwise for definite purposes.

The definitely negative result of the draw-in experiment rendered
needless prolonged observation with the box and pole test, whose results
are now to be presented.

_Box and Pole Experiment_

The eighty-four inch box, previously used for a similar test with
Julius, was presented to Sobke on August 24, the wooden cover having
been replaced by a wire one so that the monkey could readily see the
bait in the middle of the box. Sobke, when admitted to the large cage,
went directly to the box and at once discovered the banana which was
midway between the ends. He evidently desired it. Shortly, he went to
one end of the box and looked in. This he repeated later. He also shook
the box and tried to pull it about and tear it with his teeth, but to
the two poles lying nearby on the floor of the cage he gave not the
slightest attention during a thirty minute period of observation.

The experiment was not repeated because of more important work.

_Other