Creeping stealthily to the rim Jason Gridley peered downward into the canyon. Along the center of its grassy floor tumbled a mountain torrent. Giant trees grew at intervals, lending a park-like appearance to the scene; a similarity which was further accentuated by the gorgeous blooms which starred the sward or blossomed in the trees themselves.
Beside a small fire at the edge of a brook squatted a bronzed warrior, his attention centered upon a fowl which he was roasting above the fire. Jason, watching the warrior, deliberated upon the best method of approaching him, that he might convince him of his friendly intentions and overcome the natural suspicion of strangers that he knew to be inherent in these savage tribesmen. He had decided that the best plan would be to walk boldly down to the stranger, his hands empty of weapons, and he was upon the point of putting his plan into action when his attention was attracted to the summit of the cliff upon the opposite side of the narrow canyon.
There had been no sound that had been appreciable to his ears and the top of the opposite cliff had not been within the field of his vision while he had been watching the man in the bottom of the canyon. So what had attracted his attention he did not know, unless it had been the delicate powers of perception inherent in that mysterious attribute of the mind which we are sometimes pleased to call a sixth sense.
But be that as it may, his eyes moved directly to a spot upon the summit of the opposite cliff where stood such a creature as no living man upon the outer crust had ever looked upon before—a giant armored dinosaur it was, a huge reptile that appeared to be between sixty and seventy feet in length, standing at the rump, which was its highest point, fully twenty-five feet above the ground. Its relatively small, pointed head resembled that of a lizard. Along its spine were thin, horny plates arranged alternately, the largest of which were almost three feet high and equally as long, but with a thickness of little more than an inch. The stout tail, which terminated in a long, horny spine, was equipped with two other such spines upon the upper side and toward the tip. Each of these spines was about three feet in length. The creature walked upon four lizard-like feet, its short, front legs bringing its nose close to the ground, imparting to it an awkward and ungainly appearance.
It appeared to be watching the man in the canyon, and suddenly, to Jason's amazement, it gathered its gigantic hind legs beneath it and launched itself straight from the top of the lofty cliff.
Jason's first thought was that the gigantic creature would be dashed to pieces upon the ground in the canyon bottom, but to his vast astonishment he saw that it was not falling but was gliding swiftly through the air, supported by its huge spinal plates, which it had dropped to a horizontal position, transforming itself into a gigantic animate glider.
The swish of its passage through the air attracted the attention of the warrior squatting over his fire. The man leaped to his feet, snatching up his spear as he did so, and simultaneously Jason Gridley sprang over the edge of the cliff and leaped down the rough declivity toward the lone warrior, at the same time whipping both his six-guns from their holsters.
XI
THE CAVERN OF CLOVI
As Tarzan swarmed up the rope the bear, almost upon his heels and running swiftly, squatted upon its haunches to overcome its momentum and came to a stop directly beneath him. And then it was that there occurred one of those unforeseen accidents which no one might have guarded against.