creatures of Jurassic times. Some of the more recently made
hieroglyphics Tarzan's companions read with interest and commented
upon, and then with the points of their knives they too added to
the possibly age-old record of the blackened walls.

Tarzan's curiosity was aroused, but the only explanation at which
he could arrive was that he was looking upon possibly the world's
most primitive hotel register. At least it gave him a further insight
into the development of the strange creatures with which Fate had
thrown him. Here were men with the tails of monkeys, one of them
as hair covered as any fur-bearing brute of the lower orders, and
yet it was evident that they possessed not only a spoken, but a
written language. The former he was slowly mastering and at this
new evidence of unlooked-for civilization in creatures possessing
so many of the physical attributes of beasts, Tarzan's curiosity
was still further piqued and his desire quickly to master their
tongue strengthened, with the result that he fell to with even
greater assiduity to the task he had set himself. Already he knew
the names of his companions and the common names of the fauna and
flora with which they had most often come in contact.

Ta-den, he of the hairless, white skin, having assumed the role of
tutor, prosecuted his task with a singleness of purpose that was
reflected in his pupil's rapid mastery of Ta-den's mother tongue.
Om-at, the hairy black, also seemed to feel that there rested upon
his broad shoulders a portion of the burden of responsibility for
Tarzan's education, with the result that either one or the other of
them was almost constantly coaching the ape-man during his waking
hours. The result was only what might have been expected--a rapid
assimilation of the teachings to the end that before any of them