Further discussion made it seem that the section selected by Dick was about a fourth of a mile to the east of the other. Thus it would not become necessary for them to lose mutual touch. Like all boys accustomed to hunt and wander together in the woods, they had a system of signaling by means of whistling. Bunk was also familiar with the code. The three had made their wishes known when a mile apart.

“If you find him,” said Dick, “whistle three times and I’ll do the same if I succeed.”

“Suppose both fail?”

“When it becomes too dark to hunt longer, I’ll call to you; you will answer in our usual way and each will tramp toward the other. Then we’ll make camp and start in again at daybreak.”

It was agreed that in case either met the Professor or ran into danger and needed help, he would summon it by five or six short sharp blasts from his lips.

“You have your rifle and I only my revolver, so I shall be more likely to need you,” said Harvey as the brothers parted company.


CHAPTER XIV.
A NATURAL PRISON.

OUR young friend Harvey Hamilton often recalled the words of Detective Simmons Pendar. One remark impressed him when his course diverged from that of his brother, and they passed from the sight of each other. Whenever a crime or bit of wrongdoing comes to light, the officers whose duty it is to bring the guilty ones to justice proceed to formulate their theories. Their guesswork is often ingenious to the degree of brilliancy, and an error seems impossible. The skeins when unraveled must make clear everything as was promised at the beginning.