_Problem 1. First at the Left End_
The orang utan, Julius, was gentle, docile, and friendly with the
experimenter throughout the period of investigation. He at no time
showed inclination to bite and could be handled safely. As contrasted
with Skirrl and even with Sobke, he adapted himself to the
multiple-choice apparatus very promptly, and only slight effort on the
part of the observer was necessary to prepare him, by preliminary
trials, for the regular experiments. But in order to facilitate work, he
was familiarized with the apparatus by means of regular route training
and feeding in the several boxes from April 5 to April 9.
On April 10 the apparatus was painted white as has been stated
previously, and on the following Monday, April 12, Julius when again
introduced to it gave no indications of fear, uneasiness, or dislike,
but worked as formerly, making his round trips quickly and eagerly
entering any box which happened to be open, in order to obtain the
reward of food.
The regular experimentation was undertaken on April 13, and the results
of the first series of trials with Julius are sharply contrasted with
those obtained with the monkeys in that fewer choices were necessary.
Instead of the expected ratio of right to wrong first choices, 1 to 2.5,
the orang utan gave a ratio of 1 to 1. An additional markedly different
result from that obtained with the monkeys is indicated below in the
total time required for a series of trials. As examples, the data for
the first, second, fifth, and tenth series are presented.