Grasping his bridle reins the Texan disappeared and by the lightning flashes she could see him forcing his way through the thicket of willows. The scattering drops changed to a heavy downpour. The moonlight had long since been obliterated and the short intervals between the lightning flashes were spaces of intense blackness. A yellow-clad figure scrambled over the tree trunk and the cowboy took the bridle reins from her hand. "You slip through here. I'll take your horse around." On the other side, the cowboy assisted her to mount, and pulling his horse in beside hers, led off down the trail. The rain steadily increased in volume until the flashes of lightning showed only a grey wall of water, and the roar of it blended into the incessant roar of the thunder. The horses splashed into the creek and wallowed to their bellies in the swirling water. The Texan leaned close and shouted to make himself heard. "They don't make 'em any worse than this. I've be'n out in some considerable rainstorms, take it first an' last, but I never seen it come down solid before. A fish could swim anywheres through this." "The creek is rising," answered the girl. "Yes, an' we ain't goin' to cross it many more times. In the canyon she'll be belly-deep to a giraffe, an' we got to figure a way out of the coulee 'fore we get to it." Alice was straining her ears to catch his words, when suddenly, above the sound of his voice, above the roar of the rain and the crash and roll of thunder, came another sound--a low, sullen growl--indefinable, ominous, terrible. The Texan, too, heard the sound and, jerking his horse to a standstill, sat listening. The sullen growl deepened into a loud rumble, indescribably horrible. Alice saw that the Texan's face was drawn into a tense, puzzled frown. A sudden fear gripped her heart. She leaned forward and the words fairly shrieked from her lips. "It's the reservoir!" The Texan whirled to face the others whose horses had crowded close and stood with drooping heads. "The reservoir's let go!" he shouted, and pointed into the grey wall of water at right angles to their course. "Ride! Ride like hell an' save yourselves! I'll look after her!" The next instant he whirled his horse against the girl's. "Ride straight ahead!" he roared. "Give him his head an' hang on! I'll stay at his flank, an' if you go down we'll take a chance together!" Slipping the quirt from the horn of his saddle the cowboy brought it down across her horse's flank and the animal shot away straight into the opaque grey wall. Alice gave the horse a loose rein, set her lips, and gripped the horn of her saddle as the brute plunged on.