In the gray dawn after that midnight ride to Agua Fria a little Indian girl had slipped like a brown shadow across the Plaza. Stopping at the door of the Exchange Hotel, she leaned against the low slab of petrified wood that for many a year served as a loafer's roost before the hotel doorway. Inside the building Jondo caught the clear twitter of a bird's song at daybreak, twice repeated. A pause, and then it came again, fainter this time, as if the bird were fluttering away through the Plaza treetops. In that pause, the gate in the wall had opened softly, and Aunty Boone's sharp eyes peered through the crack. The girl caught one glimpse of the black face, then, dropping a tiny leather bag beside the stone, she sped away. A tall young Indian boy, prone on the ground behind a pile of refuse in the shadowy Plaza, lifted his head in time to see the girl glide along the portal of the Palace of the Governors and disappear at the corner of the structure. Then he rose and followed her with silent moccasined feet. And Jondo, who had hurried to the hotel door, saw only the lithe form of an Indian boy across the Plaza. Then his eye fell on the slender bag beside the stone slab. It held a tiny scrap of paper, bearing a message: _Take long trail QUICK. Mexicans follow far_. Trust bearer anywhere. JOSEF. An hour later we were on our way toward the open prairies and the Stars and Stripes afloat above Fort Leavenworth. In the wagon beside Mat Nivers was the little girl whose face had been clear in the mystic vision of my day-dreams on the April morning when I had gone out to watch for the big fish on the sand-bars; the morning when I had felt the first heart-throb of desire for the trail and the open plains whereon my life-story would later be written. We carried no merchandise now. Everything bent toward speed and safety. Our ponies and mules were all fresh ones--secured for this journey two hours after we had come into Santa Fé--save for the big sturdy dun creature that Uncle Esmond, out of pure sentiment, allowed to trail along behind the wagons toward his native heath in the Missouri bottoms. We had crossed the Gloriettas and climbed over the Raton Pass rapidly, and now we were nearing the upper Arkansas, where the old trail turns east for its long stretch across the prairies. As far as the eye could see there was no living thing save our own company in all the desolate plain aquiver with heat and ashy dry. The line of low yellow bluffs to the southeast hardly cast a shadow save for a darker dun tint here and there. At midday we drooped to a brief rest beside the sun-baked trail. "You all jus' one color," Aunty Boone declared. "You all like the dus' you made of 'cep' Little Lees an' me. She's white and I'm black. Nothin' else makes a pin streak on the face of the earth."