Whitey hastily removed the head covering and the gag, and Whitey eagerly asked what had happened. Slim was half choked and very indignant.

"I dunno what happened to nobody, 'ceptin' to me," he gurgled. "Gimme a drink o' watah. I'se burnin' up."

While Whitey held a cup of water to Slim's lips, Injun struggled with his bonds, and with great difficulty succeeded in releasing him. Whitey asked a hundred questions meanwhile, none of which Slim answered. He seemed entirely absorbed in his own troubles, and when he was free, he carefully felt himself all over.

"Dis is fine foh mah misery, fine!" he said bitterly.

As far as Whitey had ever been able to learn, a "misery" was a sort of rheumatism.

"How is your misery?" he asked, despairing of getting him to talk about anything but himself.

"Tehibul, tehibul," groaned Slim; "an' dey tie me wid a rawhide rope, too, dat jest eat into mah flesh." And Slim looked venomously down at the lariat that lay at his feet.

"Who tied you?" Whitey inquired.

"I dunno. Wen I wakes up dis yeah rag is bein' jammed into mah mouf, an' dis yeah coat bein' wrapped round mah haid, an' dat dere rope bein' twisted round mah body, till it cuts mah ahms an' legs somethin' scand'lus. I dunno who dey wuz, but dey suttinly wuz thorough," Slim admitted.

"Then you didn't hear anything?" Whitey demanded.

"Heah? I couldn't 'a' heard a elephant cough," Slim declared.

"Well, Whiff and String Beans and Ham just rode away," said Whitey.

"Dey did?" said Slim. Then an awful thought came to him, and he jumped to his feet. "Wheah's mah watch?" he cried. He hastily fumbled under the bedclothes, and brought to light an enormous, old-fashioned silver watch. Then he heaved a sigh of relief. "An' dat Ham gone, too! Now, how'm I goin' t' cook, wid dat misery wuss'n evah?"

It was very plain to Whitey that all Slim could think about the affair was the way it concerned him personally. Also, there was no doubt in the boy's mind that the absent men were bent on mischief. Bill and the other cowboys were surely making a night of it at the Junction, in celebration of the gold shipment. Whatever was to be done in the matter Whitey and Injun would have to do. By this time Slim was busily rubbing some horse liniment on his arms and legs.

"Injun and I will see what's to be done. You might as well go to sleep," Whitey said to him.

"Sleep! Ah couldn't sleep in Mistah Vanderbilt's bed."

"Well, stay awake, then," said Whitey, as he left the bunk house, followed by Injun.

In spite of Injun's belief that the men had not been in the ranch house, the boys took a look around, but nothing had been disturbed. Then, as they dressed, they talked things over. Whitey was not sorry that Bill Jordan was away. While not one to think ill of people, Whitey always had believed that String and Ham were queer, and the affairs of the night seemed to point to the truth of this. If Whitey could learn what sort of mischief the men were up to, it would be a feather in his cap, and it would give him great satisfaction to say "I told you so" to Bill, who always was so sure of himself. And if he and Injun could prevent the others from committing that same mischief, the boys would be something like heroes.

As Whitey and Injun talked the matter over, Whitey reviewed what took place the night he overheard the whispered conversation in the bunk house.

"They talked about the mine," he said to Injun, "and about meeting on a certain date. What day of the month is it?" he asked.

By a miracle Injun happened to know the date, for John Big Moose had told him the day in September on which the ore was to be shipped, so Injun answered briefly, "Him thirty."

"That was the date!" cried Whitey. "They said the thirtieth of September." Other scraps of the men's whispered talk began to come to Whitey's mind, and to have meaning. "They were to meet on that date, and they did. That's what String Beans was loafin g around here for, pretending to be lame. And they rode south. Don't you see?"

"Don't see nothin'," Injun answered.

"Why," Whitey declared, jumping to his feet, "they've gone toward the railroad; toward the water tank, where all the trains stop. I believe they're going to hold up the gold shipment. Come on, Injun, let's get busy."

CHAPTER IV

Solution

The moon was well down toward the western edge of the prairie when the boys rode away from the bunk house. They rode toward the south, in pursuit of the bandits, as they now called Whiff, String, and Ham. Whitey and Injun had settled on this course shortly after Whitey had decided that the men were intent on train robbery. There were several reasons for their choice.

For one thing, it was too late to go and warn Bill and the other punchers at the Junction. And even if it were not, if they did that they would have to share with the ranch men the glory of the pursuit and possible capture of the bandits. It may have been rash of the boys, but after their former adventures they felt capable of taking care of three bandits by themselves—especially if they came on them unawares, which they intended to do. Had Bill been there, it isn't likely that he would have approved of their act, but with him away the boys could find plenty of reasons for doing what they wanted to do.

Slim, the cook, had taken no interest in the affair. He was wrapped up in attending to his misery, and the boys left him in a bunk, soaked with liniment—which by rights was intended for a horse—and trying to sleep and forget his troubles.

As the horses galloped over the rolling plains into the darkness of the south, the boys were thrilled by a glow of excitement. Each had his rifle hanging in a gun-boat from his saddle. The mystery of the night; the fresh, keen stirring of the September air; the spirit of adventure; the easy, swinging motion of the horses—all these made the night's hours worth living for.

For a while, by the moon's light, Injun had easily been able to follow the tracks of the horses of the three men, and as they continued toward the south, Whitey felt sure that he had guessed correctly, so the horses were urged to a swifter pace. Little urging was necessary, however, as Whitey's "Monty" pony and Injun's pinto were fresh and seemed as eager for the chase as their masters.

Whitey's plan for thwarting the bandits was simple. Before reaching the Junction, the boys were to branch off toward the east and intercept the train. They could stand on the track and swing a lantern, which Injun carried for the purpose. When the train came to a standstill, they could get aboard, and warn the train crew. It would be easy to recruit an armed force from among the passengers, for in those days, in the West, there were few men who went unarmed. And when the bandits attempted their hold-up, they would meet with a warm reception.

The train left the Junction at six, and should reach the water tank about three-quarters of an hour later, though it often was late. As the boys had started from the ranch house at two, Whitey figured that they would have time enough, though none to waste.

The hours could not be counted, but perhaps three had passed, and through the scented, velvety darkness there came a touch of gray in the east,