Cambridge.

The results of the work on this problem demand but brief analysis and
comment. The expected ratio of one right to four wrong choices per
series appears (see table 3) for the first series of trials, and _this
in spite of the fact that Skirrl had been trained for several weeks to
choose the second door from the right end_. One would ordinarily have
predicted a much larger number of incorrect choices. The right choices
were due to the monkey's strong tendency to go first to the first door
at the right and thence to the one next to it. Indeed in the series
given on August 24; this method was followed without variation. In other
words, in every one of the ten trials Skirrl entered first the box at
the extreme right end of the group. This necessarily resulted in as many
right as wrong first choices. Consequently, the ratio reads 1 to 1. But
the method was not adhered to, and at no time either before or after
that date did he succeed in equalling this achievement. There was, as a
matter of fact, no steady improvement, and so far as one may judge from
the records which were obtained, the course of events in the solution of
this problem would have been similar to those in problem 2.

TABLE 3

Results for Skirrl, _P. irus_, in Problem 3

========+===========+==============+==============+==============+==============+==============+==============+==============+==============+==============+==============+===+===+===+===+========
Date | No. of | S.1 | S.2 | S.3 | S.4 | S.5 | S.6 | S.7 | S.8 | S.9 | S.10 | R | W | R | W |Ratio of
| trials | 5.6.7 | 5.6.7 | 1.2.3.4.5.6 | 1.2.3.4.5.6 | 4.5.6.7.8 | 4.5.6.7.8 | 2.3.4.5 | 2.3.4.5 | 3.4.5.6.7.8.9| 3.4.5.6.7.8.9| | | | |R to W
________|___________|______________|______________|______________|______________|______________|______________|______________|______________|______________|______________|___|___|___|___|________
August | | | | | | | | | | | | | | | |
| | | | {6.5.4.6 | | | | | | | {8.7.6.5 | | | | |
19 | 1- 10 | 7.5 | 6.7