Above the nocturnal diapason of the teeming jungle sounded a dismal flapping of wings and over head, through the thick night, a shadowy form passed across the diffused light of the flaring camp-fire. Sinclair raised his rifle and fired. An eerie wail floated down from above and the apparition, whatever it might have been, was swallowed by the darkness. For several seconds the listening men heard the sound of those dismally flapping wings lessening in the distance until they could no longer be heard.

Bradley was the first to speak. "Shouldn't have fired, Sinclair," he said; "can't waste ammunition." But there was no note of censure in his tone. It was as though he understood the nervous reaction that had compelled the other's act.

"I couldn't help it, sir," said Sinclair. "Lord, it would take an iron man to keep from shootin' at that awful thing. Do you believe in ghosts, sir?"

"No," replied Bradley. "No such things."

"I don't know about that," said Brady. "There was a woman murdered over on the prairie near Brighton—her throat was cut from ear to ear, and—"

"Shut up," snapped Bradley.

"My grandaddy used to live down Coppington wy," said Tippet. "They were a hold ruined castle on a 'ill near by, hand at midnight they used to see pale blue lights through the windows an 'ear—"

"Will you close your hatch!" demanded Bradley. "You fools will have yourselves scared to death in a minute. Now go to sleep."

But there was little sleep in camp that night until utter exhaustion overtook the harassed men toward morning; nor was there any return of the weird creature that had set the nerves of each of them on edge.

The following forenoon the party reached the base of the barrier cliffs and for two days marched northward in an effort to discover a break in the frowning abutment that raised its rocky face almost perpendicularly above them, yet nowhere was there the slightest indication that the cliffs were scalable.