“Then you’re inclined, now, to believe that it was purely imagination?” pursued Tom.

“Ye—–­e—–­es, it must have been,” assented Harry reluctantly.

Tom made some final casts with the light.

While they were conversing, well past the short radius of the flash lamp’s glare, a massive black head bobbed up and down with the waves.  Out there the huge negro who had swiftly vanished from the wall, and who had swum under water for a long distance, was indolently treading water.  Wholly at home in the gulf, the man’s black head blended with the darkness of the water and the blackness of the night.

“Oh, then,” suggested Reade, “we may as well go along on our way.  Plainly there’s nothing human around here to look at but ourselves.”

So they started slowly forward over the wall.  Leisurely the black man swam to the wall, taking up the dogged trail again in the darkness behind the pair of young engineers.

Several minutes more of cautious walking brought Tom Reade to a startled halt.

“Look there, Harry!” uttered Reade, stopping and throwing the light ahead.

Out beyond them, not far from the end of the wall, some hundred feet of the top had been torn away.  For all the young engineers could see, the foundations might have gone with the superstructure.

“Dynamite!” Tom muttered grimly.  “So this is the way our newly-found enemies will fight us?”

“It won’t be such a big job to repair this gap,” muttered Harry calmly.

“No; but it’ll take a good many dollars to pay the bills,” retorted Tom.

“Well, the expense can’t be charged to us, anyway,” maintained Harry.  “We didn’t do this vandal’s work, and we didn’t authorize its being done.”

“No; but you know why it was done, Harry,” Tom continued.  “It was because we drove the gamblers out of the camp, and thus made enemies for ourselves on both sides of the camp lines.”

“Anyway, the company’s officers can’t blame us for trying to maintain proper order in the camp,” Hazelton insisted stoutly.

“Not if we can stop the outrages with this one explosion, perhaps,” replied Tom thoughtfully.  “Yet, if there are many more tricks like this one played on the wall you’ll find that the company’s officers will be blaming us all the way up to the skies and down again.  Big corporations are all right on enforcing morality until it hits their dividends too hard.  Then you’ll find that the directors will be urging us to let gambling go on again if the laborers insist on having it.”

“Well, we won’t have gambling in the camp, anyway,” Harry retorted stubbornly.  “We’re simply looking after the interests of the men themselves.  I wonder why they can’t see it, and act like men, not fools.”

“We’re going to stop the gambling, and keep it stopped,” Tom went on, his jaws setting firmly together.  “But, Harry, we’re going to have a big row on our hands, and various attempts against the company’s property will be made.”