“An explosion,” came sapiently from Percy Simmons.
“As if we didn’t know that! That was no kid’s fire-cracker that went off, either,” determined Ralph.
“What, then?”
“Dynamite,” was the reply, “or some similar explosive. I felt the river heave under our boat when she went up.”
“Great gracious! A dynamite explosion!” cried Percy Simmons.
“Say, let’s get out of here! Some more might go up and then we’d be right in the middle of more trouble,” cried Harry, in rather alarmed tones.
“I hardly think we need fear another explosion,” said Ralph, “but, to be on the safe side, we’ll just stay here for a while. Then if anything more is due to go up in smoke we’ll be safe.”
“Safe!” exploded Harry.
“Why, yes. In a few minutes, if nothing happens, I mean to go ashore there.”
“You do! Are you crazy?”