The sight that met Bud's eyes was enough to startle him, though it was not what he expected to see. For he beheld Yellin' Kid standing in front of a pillar of white vapor, or, rather, the cowboy was dancing about, holding one hand in the other, and using excited slang at a rate that soon would exhaust his vocabulary, Bud thought. But, more strange than anything else, was the fact that there was no sign of a fire, to cause the white vapor, nor was there any indication that anyone besides Yellin' Kid and Bud were in the immediate neighborhood. No rustlers had started the blaze which caused the white clouds to drift upward. "What's the matter, Kid?" asked Bud, as he saw that something had happened. "Where's the fire?" "Under there!" and the cowboy pointed to the ground. "Keep away from it. Don't go near that spring, an' whatever you do, don't put your hand in. I did, an' I'm sorry for it!" "Spring! Fire! What is it, anyhow!" asked Bud, as he slid from the saddle and ran forward. "It's a boilin' spring, that's what it is!" declared Yellin' Kid. "Boilin' hot an' it near took th' skin from my hand! What you see is steam--not smoke! Horned toads and hoop-skirts! It's as hot as Buck Tooth's tea kettle! Look out for the boilin' spring!" CHAPTER XIX IN A MAZE Bud stood in amazement looking at Kid and listening to what the excited cowboy was saying. Then the gaze of the western boy rancher turned toward a depression in the ground, whence arose what he and Yellin' Kid had thought was smoke but which, in reality, was steam from a hot spring. "A boiler, eh?" repeated Bud. "First I ever knew we had any so near Happy Valley." "Me, either," went on Kid. "I suspicioned what it was when I got close and couldn't smell any wood burnin'. Then I put my hand out, but the steam fooled me. I didn't know the top of the water was so close, an' I dipped right down into it. Whew! It was hot!" "Did it scald you?" asked Bud. "Pretty nigh it," answered the cowboy, exhibiting a very red hand. At this moment a noise behind the two attracted their attention. They turned to see pointed at them the black openings of two .45 guns, and they had glimpses of eager eyes looking over the sights of the weapons. "Don't shoot! I'll come down!" laughed Bud, in imitation of what was the current saying concerning the famous Davy Crockett. "What is it?" asked Nort, owner of one of the menacing guns, as he arose and slid his .45 into the holster. "Did they get away?" Dick wanted to know, as he stood beside his brother. The two boys had left the main body and worked their way up to join the vanguard, in the persons of Bud and Kid. "There wasn't anyone to get away," Bud answered grimly. "It was only a boiling spring, and we took the steam of it for smoke." "Boiling spring!" cried Nort. "I never saw one before."