"Yes. I know I shall dream of snakes and skunks and other creeping, crawling things to-night," added Anne.

Hi laughed silently, masking his mouth with a hand.

"String a rope all the way around your tent on the ground. No snake will go over that, especially a horsehair rope. Your lasso is the thing for that, Mrs. Gray. I will have Ping keep the fire going and that will keep the skunks away. The insects and other creeping things we can't stop, so we shall have to take our chances with them. Sorry, but it was necessary to tell you. If you are going to be desert travelers you must learn the desert."

"You are perfectly right, Mr. Lang," nodded Grace. "I am very glad you have told us so much to-night, especially about skunks and snakes. I will lay my lasso around the tent and sleep in perfect security. Girls, let's turn in."

Emma dreamed of snakes that night and had nightmare, crying out in her sleep and getting a violent shaking from Elfreda Briggs as her reward. Otherwise, the night was peacefully passed.

Early on the following morning, before any of the outfit was awake, except Ping, who seemed never to sleep, Hi Lang had caught up his pony and ridden out on the desert and on to the spot at which the girls had seen the mysterious horseman the day before. Hi readily found the hoof-prints of the pony ridden by the man, and examined them with keen interest. He observed other features of the trail that might easily have escaped even a desert wanderer's observation, and that told him much.

"I reckon there's going to be some lively doings before we've got to the end of this journey," muttered the guide, assuming a listening attitude, with head tilted to one side, eyes fixed on the blue sky overhead. He stood motionless in that position for many minutes. Finally arousing himself from his reverie, Hi mounted his pony and galloped away towards the camp, reaching there some time before the Riders were awake. Grace Harlowe appeared about an hour later, and walked out over the desert a short distance, inhaling the sweet morning air in long, delicious breaths.

"What is it that smells so sweet?" she called to the guide, who was busying himself about the camp, for there was a new and strangely sweet fragrance in the air.

"That's another of the desert mysteries. Supposed to have been rain somewhere. It's like a breath straight from heaven. I love it!" Hi straightened up, and, throwing back his shoulders, inhaled deeply.

Grace was thoughtful as she returned to camp, but it was not of the desert she was thinking. Rather was it of the man who was guiding them. He was a poet by nature, but did not know it. He was intelligent and he possessed a mind and a power of reasoning far beyond what one might look for in a man of his calling.