"Now," said Jim, "except when the shifts change, you are to keep your people this side of the ditch," pointing to the line that separated the Mexican and American camps. "I have fifty men scouring the camp for whiskey. Anybody found with liquor will be arrested. If there is a particle of trouble over it in your camp, I'll let the Gringos loose. Sabez?"

Garces shivered a little. "Yes, señor," he said.

Jim took a turn up and down the street on his horse, then started for the dam site. As he cantered up the road, Billy Underwood, mounted on a moth-eaten pony, saluted with dignity.

"Boss, that saloon keeper up the canyon has got a billion bottles of booze. Worst whiskey you ever smelled. He says he's laying for you and if you cross his doorstep, he'll shoot you up."

Jim looked at Bill meditatively. "Bill, I'm going to call his bluff!"

"Us fellows in my posse'll shoot his place up if you say the word," cried Bill eagerly.

"No, that won't do," replied Jim. "But I have an idea that he's a four-flusher. Keep your eye on 'Mexico City,' Bill. I am afraid of trouble, though I've got Garces buffaloed so far."

Jim turned his horse and cantered back through Mexico City along the narrow river trail to Cactus Canyon. Just off the government reserve was a tent with a sheet iron roof. The trail to the tent was well worn. Jim dropped the reins over the pony's head and walked into the tent. There was a rough bar across one end, behind which stood a quiet-faced man with a black mustache. Drinking at the bar were two white men whom Jim recognized as foremen.

"You two fellows are fired," drawled Jim. "Turn in your time and leave camp this afternoon."

The Big Boss is king on a project. The two men meekly set down their glasses and filed out of the tent. It was something to have been fired by the big boss himself.