"Well, it was when I got here," stated the old cowboy. "And there wasn't a sign of anything wrong. But if there had been I'd expected it, 'count of----" "That black rabbit, I reckon!" broke in Bud. "Perzactly!" declared Old Billee. "A black jack shore is bad luck, at any stage of the game!" But for a time there seemed to be no truth in this western omen. Following the first mysterious disappearance of the water, and its equally strange reappearance, peace seemed to settle down over Flume Valley. The steers and yearlings, with which Bud's father had entrusted him and the boy ranchers, thrived and fattened on the succulent grass. Old Billee, Yellin' Kid, with Buck Tooth's help, aided the boys in such minor duties as were necessary to perform about the camp. The main duty was looking after the safety of the cattle, to see that none of them strayed beyond the wire fence at the far end of the valley. Should any stray from the other egress, nearest Diamond X ranch, no great harm would result, as they would still be on their owner's land. But the farther, or north end, adjoined land owned by Hank Fisher, the Double Z representative. And there were ugly stories current concerning Mr. Fisher. But as the days passed, and as the water still flowed through the pipes and underground tunnel into the reservoir, Bud and his companions began to think they had imagined more troubles than were really to occur. "Guess that warning was only a bluff," said Bud, one day. "And the black rabbit doesn't seem to have given you the jinx," added Nort. "But we didn't find that man you shot," put in Dick. "I don't believe I shot him," declared Bud. "There was blood, sure enough, but he may have stumbled, as, in fact, we saw him, and scratched himself." "But where did he disappear to?" asked Nort. "Give up," answered Bud. "We'll have to take another look after we get our first shipment out of the way." For the first bunch of steers from the Flume Valley camp were to be disposed of shortly. It was the day when this shipment was to be made that Bud, awakening early in the tent where he slept with his cousins, uttered an exclamation of surprise as he caught sight of something on the blanket that covered him. "What's the matter?" asked Dick, sitting up. "Did you leave this here?" asked Bud, as he held up a piece of board, evidently part of a packing case. "Me? No!" answered Dick. "What is it?" "Either it's a joke, or it's the black rabbit getting in his work," answered Bud. "It's from an unknown enemy--another warning!" And, as Bud held up the board, Nort and Dick could read, scrawled on it, evidently with a fire-blackened stick, the words: "Warning No. 2. When will you quit?" CHAPTER VI TROUBLE AT SQUARE M