| 6.5.4 | 7.6 | 7 | 5 | 5 | 5 | 5 | 1: 1.00
24 | 271-280 | 3 | 7 | 6.4 | 7.8 | 7.6 | 2.5 | 2 | 4 | 7.4.3.8.7.6 | 7 | 5 | 5 | 5 | 5 | 1: 1.00
25 | 281-290 | 3 | 7 | 2.5.4 | 8 | 7.6 | 5 | 2 | 6.4 | 7.6 | 7 | 6 | 4 | 6 | 4 | 1: 0.67
26 | 291-300 | 3 | 7 | 6.5.4 | 8 | 7.6 | 7.6.5 | 2 | 6.5.4 | 7.6 | 7 | 5 | 5 | 5 | 5 | 1: 1.00
27 | 301-310 | 3 | 7 | 2.6.5.4 | 8 | 7.6 | 5 | 2 | 6.5.4 | 7.5.4.9.8.6 | 7 | 6 | 4 | 6 | 4 | 1: 0.67
28 | 311-320 | 3 | 7 | 2.5.4 | 8 | 6 | 9.8.7.5 | 2 | 3.4 | 8.6 | 7 | 6 | 4 | 6 | 4 | 1: 0.67
========+===========+==============+==============+==============+==============+==============+==============+==============+==============+==============+==============+===+===+===+===+========

[Footnote *: Aided by experimenter.]

I immediately set about reinstating the former attitude by lessening the
number of trials and the punishment, and by increasing the value of the
reward, but my best efforts, continuing up to August 28, failed markedly
to improve the condition. The number of correct choices did somewhat
increase, but at no time did the animal attain the degree of success
which he had achieved as early as July 31 in the eleventh series of
trials.

During the last two weeks of experimentation, all possible efforts were
put forth to discover the best combination of rewards and punishments.
Punishment was varied from 0 to confinement of sixty seconds, and many
kinds of food in different amounts were tried as rewards, but in spite
of everything Sobke failed to improve markedly. From time to time,
notably on August 12 and 21, he exhibited peculiarly strong resentment
toward me and repeatedly attempted to attack me.

The outcome of my experiments with problem 4 is peculiarly interesting
in that it indicates the importance of a favorable attitude toward the
work and the extreme risk from disturbing or discouraging conditions. It
seems not improbable that had the work progressed wi