At once the professor’s face grew grave, and his mind went back to a certain night in Caracas when Hockley had gone off with Dan Markel and lost all his money. Had the youth been equally misguided on this occasion?

“I will go below and make inquiries concerning him,” he said, and left them.

“I’ll wager Glummy has gone and done it again,” said Frank in a low voice.

“More than likely,” answered Sam. “How foolish for him if he has! He might have had a very pleasant evening with us.”

“Oh, Glummy has a big head and thinks he knows it all,” came from Darry. “Some time he’ll catch it worse than he did when he went out with that Markel.”

So the comments of the boys ran on. In the meantime Professor Strong had followed up Hockley from the hotel proper to the café and here learned that the lad had come in early in the evening for a package of cigarettes and then gone out on the street.

“Did he have any liquor?” asked Professor Strong, sharply.

“I do not think so, señor,” was the reply. This was a deliberate falsehood, but the proprietor of the drinking resort did not wish to get himself into any trouble.

More mystified than ever the professor went out on the street and looked up and down. He could see nothing of Hockley, and now the thoroughfares were becoming gradually deserted.

It must be confessed that Amos Strong was in a quandary. What had become of his charge he could not imagine, although he strongly feared that Hockley had gone off to see the sights and gotten into some sort of trouble.