Hour after hour went by, and the only sign of its passage was that a dim, yellowish centre of illumination, that had once been the sun, crept slowly across the sky. As the day grew older Conrad's pain from his injury became more acute. Most of the time he felt it only as an insistent background to the keen outward discomfort of stinging sand and pounding wind. But when an occasional sharper twinge brought it more vividly to his consciousness he swore a little between his teeth, and thought of the letter he was going to write to Dellmey Baxter. The particles of sand filled his hair and encrusted his face and neck until they were of a uniform brick-red. Constant effort and encouragement were necessary to keep Brown Betty in the road, and finally he was compelled to walk at her head most of the time and with a guiding hand on her bridle counteract the unflagging urge of her instinct to drift before the blast. Thus they battled their way through the hot, beating wind and suffocating sand, while that vague core of light moved athwart the dirty heavens, dropped slowly down the western sky, and was swallowed up in the denser banks of dusk above the horizon. It had been too dark before for the discernment of objects, but a yellowish glare had filtered through the sand-laden air, lending a lurid, semi-translucence to the atmosphere. Now even that was gone, leaving a desert enveloped in pitchy darkness, while the wind roared about the ears of the travellers and pounded their bodies as with cudgels and the sand pelted their skins. Most of the time Curtis depended upon the feel of the road under his feet to maintain his direction, but now and then it was necessary for him to get down on his hands and knees in order to recover the track from which they had begun to stray. Once his fingers came in contact with a small feathered body. The bird tried to start up under his hand. He knew it must be disabled and placed it inside his shirt. Thus they plodded on through the night and the storm, the pain in his shoulder growing keener and the torture of the wind and sand ever more nerve-racking. At last the mare raised her head and gave a long whinny. Conrad felt sure that she was announcing their near approach to the food and shelter within the adobe houses. "What is it, Betty? Do you know where we are?" he asked, and she rubbed her nose against his face, nickered, and pulled at the bridle with the evident desire to turn from the direction they were pursuing. Curtis knew they were in a little hollow, and thought it might be that into which the road dipped after leaving the houses.