13. To push a log into position parallel with others.

14. To balance and carry timbers on the tusks, if possessing tusks
of sufficient size.

15. To "speak," or trumpet.

16. To work in harness.

Every working elephant in India is supposed to possess the
intelligence necessary to the performance of all the acts
enumerated above at the command of his driver, either by spoken
words, a pressure of the knees or feet, or a touch with the
driving goad. For the sake of generalization I have purposely
excluded from this list all tricks and accomplishments which are
not universally taught to working elephants. We have seen,
however, that performing elephants are capable of executing
nearly double the number of acts commonly taught to the workers;
and, while it is useless to speculate upon the subject, it must be
admitted that, were a trainer to test an elephant's memory by
ascertaining the exact number of commands it could remember and
execute in rotation, the result would far exceed anything yet
obtained. For my own part, I believe it would exceed a hundred.
The performance in the circus-ring is limited by time and space,
and not by the mental capacity of the elephants.

Comprehension under Training. When we come to consider the
comparative mental receptivity and comprehension of animals under
man's tuition, we find the elephant absolutely unsurpassed. On