ables him to insert
his hand or use his teeth effectively. Many times during this experiment
he was observed to examine the boxes on all sides in search of some weak
point. If no such weak point were found, he shortly left the box; but if
he did find a favorable spot, he usually succeeded, before he gave up
the attempt, in doing considerable damage to the box.

Following the behavior described above, Skirrl returned to the middle
sized box, placed it on end under the banana, mounted, and looked upward
at the bait, but as it was a few inches beyond his reach, he made no
attempt to get it, but instead, after a few seconds, went to the
smallest box, and finding a weak point, began to tear it to pieces.

Later he rolled what was left of the smallest box close to the other two
boxes, nearly under the banana, and the remainder of his time was spent
gnawing at the boxes and playing with pieces which he had succeeded in
tearing from them. During the remainder of the thirty minute interval of
observation, no further attention was given the bait.

Again, on August 25, the test was tried, but this time with boxes whose
edges had been bound with tin so that it was impossible for the monkey
to destroy them. He spent several minutes searching for a starting point
on the middle sized box, but finding none, he dragged it under the
banana, looked up, mounted the box, but, as previously, did not reach
for the bait because it was beyond his reach. He then played with the
boxes for several minutes. Finally he worked the two smaller boxes to a
position directly under the banana, put the middle sized one on end,
mounted it, and looked at the bait, but again abandoned the attempt
without reaching.

During the thirty minutes of observation he made no definite effort to
place one box upon another. Three times he mounted one or another of the
boxes when it was under the banana or nearly so, but in no case was it
possible for him to reach the bait.

From the above description of this monkey's behavior, it seems fairly
certain that with sufficient opportunity, under strong hunger, he would
ultimately succeed in obtaining the bait by the use of two or more
boxes. For his somewhat abortive and never long continued efforts to
drag two boxes together or to place the one upon the other clearly
enough indicate a tendency which would ultimately yield success. The
possibility of imitation is not excluded, for Skirrl had opportunities
to see Julius an