and
other eagerly sought foods in varying quantities, and in the latter are
included periods of confinement ranging from ten seconds to sixty
seconds. In the end, confinement of about thirty seconds, combined with
a small quantity of food which was much to the monkey's taste, gave most
favorable results.

All this time Skirrl's attention to the task in hand was seldom good. He
was easily diverted and even when extremely hungry, often stopped work
in the middle of an early trial, yawned repeatedly and finally sat down
to wait for release from the apparatus.

The results obtained during the long continued trials with this animal
in problem 2 are presented in table 2, which differs from the previously
described table, first, in that several of the trials are followed by an
asterisk to indicate that aid was given by the experimenter, and second,
in that two additional columns, headed, respectively, R and W, are
presented. These give the right and wrong first choices for each day,
whereas the two columns preceding them give the same data for each
series of ten trials. Similarly, the ratio of right to wrong choices is
presented for each day in table 2, instead of for each series of ten
trials as in table 1.

From the results of table 2, several peculiarly interesting facts
appear. In the first place the influence of the habit of choosing the
first box at the left disappears with surprising suddenness, and in the
second place, there are remarkable contrasts in the results for
different settings as they appear in their respective vertical columns.
Thus, in the case of setting 1, after the first trial mistakes became
relatively infrequent, whereas in setting 6, which involved the same
number of doors, mistakes continued to be the rule until nearly a
thousand trials had been given. The most likely explanation of this
difference is that for some reason the animal avoided box 9.

The _reactive tendencies_, or better, the _methods of reaction_ which
manifested themselves during this long series of observations may be
described as follows: (a) choice of the first box at the left; (b)
random choice with tendency to choose first, a box near the middle of
the group; (c) choice of first box at the right followed by the one next
to it on the left; (d) direct choice of the right box.

TABLE 2

Results for Skirrl, _P. irus_, in Problem 2

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