"It is, in all probability, fifteen hundred years or more since the first inhabitants of this mesa dwelt here," announced the professor.
"My! My! You could boil an egg in that time," commented Pete, drawing out his old black briar and lighting it. He lay on one elbow and began to smoke contemplatively.
The others did not speak for a few moments, so engrossed were they with the ideas that the professor had summoned up. Once, perhaps, this dead, black, empty mesa above them had held busy, bustling life. Now it stood silently brooding amid the desolation stretched about it, as solitary as the Sphinx itself.
The spot at which they were camped was the sheer, or cliff side of the mesa. At the other side they knew, from Coyote Pete's description, were numerous openings and a zig-zag pathway leading up to the very summit. It was on this summit, which according to the most accurate information obtainable had once been used for the sacrificial rites of sun worship, that the professor expected to find the relics for which he was searching.
For an hour or two the lads discussed the dead-and-gone mesa dwellers, with an occasional word from the professor, who was deeply read on the subject. This was all so much Greek to Pete, who solemnly smoked away, every now and then putting in a word or two, but for the most part lying in silence, looking out beyond the black shadow of the mesa across the moonlit desert toward the rocky hills to the south.
Suddenly, the lanky cowboy leaped to his feet with a yell that punctured the silence like a pistol-shot. In two flying leaps, he had bounded clear over the professor's head, and was in among the tents, searching for his pistol. Before one of the amazed group about the fire could collect his senses at the sudden galvanizing of Coyote Pete, he was back among them again.
"Wow!" he yelled into the night, "come on, there, you, whoever you are! Come on, I say! I'll give you a fight! Yep, big as you are, I ain't skeered of you."
"Pete! Pete! Whatever is the matter?" gasped Jack, who, with the others, was by this time on his feet.
"Matter?" howled Pete. "Matter enough. I do begin to think this place shore is haunted, or suthin'. As I lay there, I felt suthin' tiptoeing about behind me, and when I whipped suddenly round ter see if one of the critters hadn't broken loose, what did I see but a great, big, enormous thing, as big as a house, looking down at me. Afore I could say a word, it was gone."
"Gone!" echoed the others. "What was it?"