6 | 6.7 | 1 | 9 | 1 |19 | 1:19.00
25 | 81- 90 | 5.6 | 3.4 | 6.7.8.9 | 5 | 5.6.7 | 2.3 | 7.8 | 1.2 | 5.6 | 4.5.6.7 | 1 | 9 | | |
" | 91-100 | 5.6 | 3.4 | 6.7.8.9 | 3.4.5 | 6.6.7 | 2.3 | 6.7.8 | 1.2 | 5.6 | 6.7 | 0 |10 | 1 |19 | 1:19.00
| | | | | | | | | | | | | | | |
26 | 101-110 | 5.6 | 3.4 | {6.7.8.8 | 3.5 | 5.6.7 | 2.3 | 5.6.7.6.7.8 | 1.2 | 5.6 | 6.7 | 0 |10 | | |
| | | | {6.7.6.9 | | | | | | | | | | | |
| | | | | | | | | | | | | | | |
| | | | {6.7.8.8 | | | | | | | | | | | |
" | 111-120 | 5.6 | 2.3.4 | {6.7.8.7 | 3.4.5 | 5.6.7 | 2.3 | 7.8 | 1.2 | 5.6 | 4.5.6.7 | 0 |10 | 0 |20 | 0:20.00
| | | | {6.7.9* | | | | | | | | | | | |
| | | | | | | | | | | | | | | |
========+===========+==============+==============+==============+==============+==============+==============+==============+==============+==============+==============+===+===+===+===+========

[Footnote *: Aided by experimenter.]

The evidence suggests that in this young orang utan ideational learning
tended to replace the simpler mode of problem solution by trial and
error. Seemingly incapable of solving his problems by the lower grade
process, he strove persistently, and often vainly, to gain insight. He
used ideas