Firmstone gave a few directions, and then turned to his work.

Shortly after twelve Luna was surprised at seeing the superintendent enter the mill.

"Cut off the feed in the batteries."

The order was curt, and Luna, much bewildered, hastened to obey.

Firmstone followed him around back of the batteries, where automatic machines dropped the ore under the stamps. Firmstone waited until there began to come the sound of dropping stamps pounding on the naked dies, then he gave orders to hang up the stamps and shut down the mill. This was done. The rhythmic cadence of the falling stamps was broken into irregular blows as one by one the stamps were propped up above the revolving cams, till finally only the hum of pulleys and the click of belts were heard. These sounds also ceased as the engine slowed and finally stopped.

"Shall I lay off the men?" asked the foreman.

"No. Have them take out the screens."

This also was done, and then Firmstone, accompanied by Luna, went from battery to battery. They first sc.r.a.ped out the loose rock, and afterward, with a long steel spoon, took samples of the crushed ore from between the dies. The operation was a long one; but at length the last battery was sampled. Firmstone put the last sample in a sack with the others.

"Shall I carry the sack for you?" asked Luna.

"No. Start up the mill, and then come to the office." Firmstone turned, and, with the heavy sack on his shoulder, left the mill.

There were a hundred stamps in the mill. The stamps were divided into batteries of ten each. Each battery was driven separately by a belt from the main shaft. There was a man in attendance on every twenty stamps.

Firmstone had taken samples from each battery, and each sample bore the number of the battery. He had taken especial care to call this to Luna's attention.

The foreman saw to replacing the screens, and, when the mill was again started, he went to the superintendent's office. He knew very well that an unpleasant time awaited him; but, like the superintendent, he had his course of action mapped out. The foreman was a very wise man within a restricted circle. He knew that the battle was his, if he fought within its circ.u.mference. Outside of the circle he did not propose to be tempted. Firmstone could not force him out. Those who could, would not attempt it for very obvious and personal reasons. Luna was aware that Firmstone knew that there was thieving, and was morally certain as to who were the thieves, but lacked convincing proof. This was his protecting circle. Firmstone could not force him out of it. Morrison and Pierre knew not only of the thieving, but the thieves. They could force him out, but they would not. Luna was tranquil.

Luna saw Firmstone in the laboratory as he entered the railed enclosure.

He opened the railing gate, pa.s.sed through the office, and entered the laboratory. Firmstone glanced at the foreman, but he met only a stolid face with no sign of confusion.

"Pan these samples down."

Without a word Luna emptied the sacks into little pans and carefully washed off the crushed rock, leaving the grains of gold in the pans.

Eight of the pans showed rich in gold, the last two hardly a trace.

Firmstone placed the pans in order.

"What do you make of that?" he asked, sharply.

Luna shook his head.

"That's too much for me."

"What batteries did these two come from?" Firmstone pointed to the two plates.

"Nine and Ten," the foreman answered, promptly.

"Who works on Nine and Ten?"

"Clancy day and Long night," was the ready answer.

"Did Long work last night?"

"No. He was sick. I told you that, and I asked you if I should put on Morrison. You didn't say nothing against it."

"Did Nine and Ten run all night?"

"Except for an hour or two, maybe. Nine worked a shoe loose and Ten burst a screen. That's likely to happen any time. We had to hang up for that."

"You say you can give no explanation of this?" Firmstone pointed to the empty pans.

"No, sir."

"Look this over." Firmstone went to his desk in the office and Luna followed him. He picked up a paper covered with figures marked "Mine a.s.says, May," and handed it to the foreman.

Luna glanced over the sheet, then looked inquiringly at Firmstone.

"Well?" he finally ventured.

"What do you make of it?" Firmstone asked.

Luna turned to the a.s.say sheet.

"The average of two hundred a.s.says taken twice a week, twenty-five a.s.says each time, gives twenty-five dollars a ton for the month of May."

Luna read the summary.

Firmstone wrote the number on a slip of paper, then took the sheet from the foreman.

"You understand, then, that the ore taken from the mine and sent to the mill in May averaged twenty-five dollars a ton?"

"Yes, that's right." Luna was getting puzzled.

"Very good. You're doing well. Now look at this sheet." Firmstone handed him another paper. "Now read the summary."

Luna read aloud:

"Average loss in tailings, daily samples, May, two dollars and seventy-five cents a ton."

"You understand from this, do you not, that the gold recovered from the plates should then be twenty-two dollars and twenty-five cents a ton?"

"Yes, sir." Luna's face was reddening; beads of perspiration were oozing from his forehead.

"Well, then," pursued Firmstone, "just look over this statement. Read it out loud."

Luna took the paper offered him, and began to read.

"What do you make out of that?" Firmstone was looking straight into the foreman's eyes.

Luna tried his best to return the look, but his eyes dropped.

"I don't know," he stammered.