icult to obtain strictly comparable results from
series to series and from day to day. The data for this problem, as
presented in table 9, have values quite different from those for the
monkeys, chiefly because of the more variable conditions of observation.

It was occasionally noted that the disintegration of a definite method
and the disappearance of the tendency on which it depended occurred
rather suddenly. Frequently it happened that having used an inadequate
method fairly persistently on a given day, the animal would on the
following day exhibit a wholly different method. Even over night a new
method might develop. In the monkeys, although there was occasionally
something comparable with this, it was by no means so evident.

TABLE 9

Results for Orang utan in Problem 2

========+===========+==============+==============+==============+==============+==============+==============+==============+==============+==============+==============+===+===+===+===+========
| No. | S.1 | S.2 | S.3 | S.4 | S.5 | S.6 | S.7 | S.8 | S.9 | S.10 | | | | | Ratio
Date | of | | | | | | | | 1.2.3.4.5 | | | R | W | R | W | of
| trials | 7.8.9 | 1.2.3.4 | 2.3.4.5.6.7 | 1.2.3.4.5.6 | 4.5.6.7.8 | 1.2.3 | 2.3.4.5 | 6.7.8.9 | 1.2.3.4 | 3.4.5.6.7.8 | | | | | R to W
--------+-----------+--------------+--------------+--------------+--------------+--------------+--------------+--------------+--------------+--------------+--------------+---+---+---+---+--------
| | | | | | | | | | | | | | | |
May | | {7.7.7.7 | | | | | | | | | | | | | |
17 | 1- 10 | {7.7.7.7 | 1.1.3 | 2.4.6 | 2.3.4.5 | 4.5.7 | 3.2 | 2.3.4 | {2.3.4.5 | 1.2.3 | 3.4.5.6.7 | 0 |10 | 0 |10 | 0:10.00
| | {7.7.8 | | | | | | | {6.7.8