CHAPTER VII.
At the shout which Coronado uttered on seeing Texas Smith's pistol aimed at Thurstane, the assassin turned his head, discovered the train, and, lowering his weapon, rode peacefully alongside of his intended victim.
Captain Phin Glover's mule was found grazing behind the butte, in the midst of the gallant Captain's dishevelled baggage, while the robbers had vanished by a magic which seemed quite natural in this scenery of grotesque marvels.

They had unquestionably seen or heard their pursuers; but how had they got into the bowels of the earth to escape them?
Thurstane presently solved the mystery by pointing out three crouching figures on the flat cap of stone which surmounted the shales and marl of the butte.

Bare feet and desperation of terror could alone explain how they had reached this impossible refuge.

Texas Smith immediately consoled himself for his disappointment as to Thurstane by shooting two of these wretches before his hand could be stayed.
"They're nothin' but Injuns," he said, with a savage glare, when the Lieutenant struck aside his revolver and called him a murdering brute.
The third skulker took advantage of the cessation of firing to tumble down from his perch and fly for his life.

The indefatigable Smith broke away from Thurstane, dashed after the pitiful fugitive, leaned over him as he ran, and shot him dead.
"I have a great mind to blow your brains out, you beast," roared the disgusted officer, who had followed closely.