"Hark, some one is coming," said Jack, dropping down on his hands and knees, an example which Sam followed. Then came a cautious signal, a whistle.
"It's John Smith, my Indian friend!" exclaimed Jack. "He must have just got back," for the half-breed had been away for a few weeks, as one of his relatives was ill. Jack sounded a cautious whistle in reply, and soon the Indian student was at his side. There were hurried greetings, and Jack soon explained the situation.
"Let me think it over a minute," said John Smith. "It takes me rather suddenly."
For a few seconds John remained in deep thought. Then he exclaimed:
"I think I have it. Have you any chemicals in your room, Jack?"
"Plenty," was the answer. "I've been boning on that lately, and I got a fresh supply from the laboratory the other day to experiment with."
"Then I think we'll make these chaps open their eyes."
The three friends hurried to Jack's room, where they were busy for some time, behind carefully drawn shades. At the end of about two hours, Jack, who had been keeping watch from a window, exclaimed:
"There they go with the stuff. It's time we got a move on."
"They'll not set it off until midnight," spoke Sam, "That's what they said. We'll have time enough to do what we are going to."