Of course, in many instances people had forgotten all about this fact, even if they paid any attention to it at the time, and so it was not easy to glean any intelligence of them now. But by persistent inquiries, and explaining why he was so anxious to trace them, Jack learned enough to convince him that he was on their track, and now he must be careful not to lose the trail. A boy showed him where they had lighted a fire on the heath, and by noting this and other marks upon the grass, the lad thought he should be able to detect where they had been in other places.