5. Use a key to lock and unlock a padlock. The animal most
proficient in this became able to select the right Yale key out of
a bunch of half a dozen or more, with as much quickness and
precision as the average man displays.

The orang Dohong learned to pedal and to guide a tricycle in about
three lessons. He caught the two ideas almost instantly, and soon
brought his muscles under control sufficiently to ride
successfully, even under difficult conditions.

It was quickly recognized that our Rajah was a particularly good
subject, and with him the keepers went farther than with the four
others. From the first moment, the training operations were to him
both interesting and agreeable. The animal enjoyed the work, and
he entered into it so heartily that in two weeks he was ready to
dine in public, somewhat after the manner of human beings.

A platform eight feet in height was erected in front of the
Reptile House, and upon it were placed a table, a high chair such
as small children use, and various dishes. To the platform a step-
ladder led upward from the ground. Every day at four o'clock lusty
Rajah was carried to the exhibition space, and set free upon the
ground. Forthwith the keepers proceeded to dress him in trousers,
vest, coat and cap. The moment the last button had been fastened
and the cap placed upon his head, he would promptly walk to the
ladder, climb up to the platform, and in the most business-like
way imaginable, seat himself in his chair at the table, all ready
to dine.