Jim and Jack saw nothing moving in the sage brush or beyond it and there was no one in sight. Their impression must have been a mistake, for the only living thing in view was a flock of wild geese which flew over their heads uttering their shrill clamor. Jim sat erect, silent and watchful as an Indian, on the back of his equally motionless pony, his hand shading his eyes.

Jack waited on her horse gazing at the quiet waters of Rainbow Creek. Suddenly there came a low rumble inside the earth, like a note of warning, and then the land began to rise in sandy billows as though wave on wave were seeking some distant shore. The two horses with their silent riders shook as with the ague; the face of Rainbow Lake shivered, then her waters lashed the shores as though they had been parted asunder, and a moment later receded and began to disappear. It was as if old Father Neptune had deserted his home at the bottom of the sea to play his mighty games in the shallow waters of Rainbow Creek. It seemed as though he had blown a great blast through his sacred horn and caused the water to spurt upward, then had drawn it slowly back into his horn again.

The noise and the movement died away.

"Was it an earthquake, Jim?" Jacqueline managed to murmur, as soon as she could get her breath. She had slipped quietly off her pony and was patting it softly, for the broncho was terribly frightened at the strangeness of his experience.

Jim nodded solemnly. "A human earthquake, I guess. Don't be alarmed, it won't occur again, but get to cover quickly."

Jacqueline Ralston knew as well as though she had been a pioneer woman trained to warfare with the Indians in the early days in the West, what Jim's mysterious words, "get to cover," meant. She and Jim used to play, long years before, that they were travelers across the plains, being hunted down by bands of roving Indians. This was when Jack was a small, bronze-haired tomboy, riding bare-back over the prairies, swimming with her father in the clear, cold mountain streams, afraid of nothing and of no one, the pride of every cowboy on Rainbow Ranch. Later she had learned the value of hiding in ambush in stalking wild game. But, even if Jack had not understood the importance of Jim's advice, she had been trained to obey instantly the word of a superior officer in the moment of action.

It was not an easy matter to seek shelter with a broncho fourteen and a half hands high in the particular part of the ranch where Jack and Jim happened to be at this moment. There were no trees, no underbush of any kind. The trees that are usually found near the beds of streams in the western country, were on the far side of Rainbow Creek. There was no time to wade across. Jack dropped her reins, hoping her pony would wander quietly away. She bent forward and ran as swiftly and silently as possible toward the straggling rail fence. Then she lay down in the short brown grass, as motionless as a frightened partridge who tries to make the hunter believe he is a part of the still landscape. Jim Colter crawled after Jack, bringing with him his long rope.

A few minutes later a man's figure rose up from the screen of sage bushes on the Norton ranch and the sun glinted on a bright red head. The boy swung his hat in the air once, twice, three times. Then he repeated the signal.

Jim crept through the fence like an eel. Without making the least sound that could be heard by the fellow, whose back was turned to him, Jim got within thirty feet of his enemy.

Jack wondered what on the face of the earth Jim intended to do. Then her eyes widened with surprise and with laughter. There was a swish, a streak through the air, as Jim's lariat uncoiled. Hearing the noise the boy turned and the rope caught him around the waist, pinning his arms securely to his side. He was lassoed as safely as any wild pony.

Jim then calmly started to walk back toward the rail fence that divided the two ranches. He seemed blissfully indifferent to the fact that he dragged an angry and sputtering young man at the end of his rope. Dan Norton, Jr., was a heavy, stocky fellow, with a good deal of brute strength, but Jim Colter was long and lean, with muscles of steel. Besides, as Dan threw his resisting strength against that of his opponent, the rope tightened about him and cut more deeply into his flesh. He kicked viciously like an unruly colt, but Jim did not condescend to look behind him; his victim was kicking nothing but air, as Jim was ten yards in front.

"What are you doing? Where are you going?" Dan shouted, almost choking with rage.

Jack rose up from behind the shield of the fence. The sight of Jim and his prize was too beautiful, and Jack felt that she was being repaid for many of the cruel tricks that Dan and his father had played on her since she was a little girl. She recalled the time that Dan had nearly put out her eyes, when she was only four years old. She had been playing with him and when she lifted her face to his in answer to some question, he had thrown a great box of sand straight into her wide-open eyes. It was curious how well Jack remembered the deed at this moment.

"Let me go, I'll have you in jail for this. What do you mean by trespassing on my land?" Dan yelled.

Jim laughed and drew Dan closer to him. "Don't get so upset, sonnie, I am not going to trespass on your land," he urged quietly. "This rope is just a little scheme of mine to make you cross the great divide between your ranch and ours, while we talk a few things over." Jim hauled Dan through an opening in the fence.

Jack dared not look straight at them. She did feel it would be too hateful of her to laugh out loud, yet how could she help it? Dan was so desperately angry that it made him fume and fuss and jump about like an excited rooster, and his red head did suggest a rooster's comb.

"Look out, Jim," Jack sang out. "Here come the men Dan was signaling."

Across one of the Norton fields, with their gaze centered on the clump of sage where they expected to find their young master, marched three cowboys from the Norton ranch.

"Come here," Dan shouted, trying in vain to loosen one of his hands to wave to his men.

Jim slipped one of his Colts out of its holster and passed it over to Jack. "Just keep this for me, will you, Miss Ralston?" he asked politely. "There won't be any use for it, but there is no harm in having it handy."

Jim spoke to the puzzled ranchmen and greeted them calmly. "Come as far as you like on your own side of the fence," he said, "but kindly stop right there. I have a few questions I would like to ask Mr. Daniel Norton, Jr., and I wouldn't object to some witnesses. Needn't be afraid, the earthquake is all over. Mr. Norton and I are going to talk quite neighborly and friendly like, as soon as he cools off a bit."

Jim Colter spoke so quietly that the men who watched him knew he meant business. You see Jim's reputation was that he was one of the most dangerous men in the country when he was aroused, and there was no doubt of his present feeling.

The three men nodded respectfully. They did not wish to have a fight, for if they attacked Jim and tried to get Dan Norton away from him, he would undoubtedly use his pistol, and then there was Jacqueline.

The cowboys jerked their heads at Jack in a greeting intended to be exceedingly polite. Jack understood and returned the men's bows with her best smile. She did not desire to let Jim make the affair with Dan too serious if she could help it, but she had rarely seen their overseer so deeply angry in her life.

An Eastern girl and most Western ones would have been horrified at Jacqueline Ralston's present position. She was standing, a quiet and attentive listener, in a group of five uncultured men. One of the cowboys was Josef, the Indian Laska's son, the other a Mexican, and but one of the three an American. They were all angry and lawless and only one of the five her friend, yet Jacqueline did not think of her position as unusual. She was far too much interested in what was about to take place to think of herself at all and knew that not one of the cowboys would touch her and she was not in the least in fear of Dan. Jacqueline Ralston was not like a girl with a father and mother to care for her. She had been brought up with the ideas of a pioneer woman and was trying to run a ranch and to make a living for herself, her cousin and sister, and if there was any danger that threatened their property or them, she must know what it was and must do what she could to prevent it. Jack was leaning on a rail of the fence. Her hat had fallen on the ground and her face was white, yet it held a look of quiet power and strength remarkable in a girl so young.

Jim was aggravatingly slow. He was facing Dan Norton while the cowboys hung over the pickets. Dan had ceased to struggle, but still refused to look either at Jim or Jack.

"Our little talk ain't going to take but a few minutes, sonnie, if you will answer my questions straight from the shoulder," Jim drawled. "Did any of you feel a bit of a shock, say like an earthquake, a few minutes back? It 'peared like the ground near Rainbow Creek had gotten tired of not being heard from for some time past and had suddenly swelled up and bust."

Jim pointed toward the lake only a few yards from them. Jack was startled to see how much lower the water was. Could it have fallen an inch in such a little while?

Dan shook his head scornfully. "Earthquake! No, you are off your base," he sputtered. "That is, at least I did feel a slight motion, but it didn't amount to much. I don't see how you can hold me responsible for an earthquake. Say fellers, Jim Colter is pretty far gone isn't he, if he thinks I am powerful enough to move the earth." Dan grinned, delighted with his own wit, but his cowboys only continued to stare at him solemnly.

"Glad you felt a little motion, though you was pretty safe out of the way," Jim went on in the same quiet fashion. "Seems like I could shut my eyes and tell you just how that earthquake happened. You ought to have seen the waters of Rainbow Creek dash up in the air and then begin to slide plum out of sight. It was most like a miracle."

Dan faced Jim impudently. "Well, go on, tell us how your miracle happened?" he invited scornfully.

Jacqueline was puzzled. She had no idea how Jim would be able to explain the peculiar phenomenon which they had just seen.

"Oh, a charge of dynamite caused our little earthquake," Jim explained briefly.

"You see, Mr. Norton, you have been trying to drain the water from our creek to your ranch for some time back, but digging a lower channel was pretty slow work. That little bunch of dynamite just between your land and our lake has made a pretty nice passage for our water to flow through. I suppose you made your entrance underground somewhere near that clump of sage brush, so it would be hard for us to discover."

Dan shrugged his heavy shoulders, "What rotten nonsense," he returned sullenly.

Jacqueline's eyes were fairly starting with surprise and she opened her lips to ask a question but closed them quickly. She couldn't expect to comprehend Jim's accusation. What girl ever has understood anything about engineering?

Jim laughed, straightened up and glanced toward the three cowboys, who were grouped picturesquely on the opposite side of the divide. "Oh, you don't have to take my word for it," he remarked casually, "I will have one of the State engineers over to prove it to you. You see if there is one thing we are strict about in Wyoming, it is our water rights.

"You and your father shall pay us a tidy sum of money in damages for this work." Jim slowly let go the tight knot which had held Dan Norton. "Now get along home when you like, young man," he concluded. "I am through with you for to-day."

Dan flung the lasso to the ground and glared angrily at Jim and then at Jack. But his eyes fell before Jacqueline Ralston's. Jack was looking at him steadily with the scornful, slightly haughty expression he so hated.

Dan smiled. His light blue eyes were almost green with temper and narrowed into two fine lines. "Oh, it don't matter about your old creek, at present," he jeered. "You can keep the water on Rainbow Ranch for another few months, when father and I take possession of the ranch, we can drain the water over here if we like. So long!" and he glanced contemptuously at Jack, as he marched by her.

Jack had her riding whip in her left hand. For a second she longed to strike at Dan Norton with it. How dared he speak in that calm and self-assured fashion of some day taking possession of their own beloved Rainbow Ranch? Jack's heart was like lead, but not a muscle of her lovely face moved, her eyelashes did not even tremble.

Jim watched Dan sneak across the divide and he and Jack waited until the four men started on foot across the plain. Then Jim smiled a slow smile which meant many things. "Don't you worry quite so much about our losing our ranch, Jacqueline Ralston," Jim announced. "If old Daniel Norton had felt so sure he was going to succeed in getting our place away from us, he would never have tried to steal our water at this stage of the game."

The two horses were grazing near by and Jim lifted Jack into her saddle. They turned their faces toward Rainbow Lodge.

Once or twice, Jim rubbed his chin. "Pretty good day's work for us, boss?" he asked finally.

Jack's eyes danced and a deep rose color glowed in her cheeks. She did not look in the least like the girl who had received in tears the news of the possible loss of her home.

Jack laughed softly, under her breath. "It sure was a good day's work, overseer, and we'll fight till the hat drops," she answered, in the tone of another cowboy. Then Jack flicked her pony with her whip. "Do let's hurry, Jim," she called gaily. "I never saw anything in my life so delicious as the picture you made lassoing Dan. I am just dying to get home to tell the other girls."