"It's not my business to place him anywhere," cried Nat, hastily. "For all we know, he may be harmless."

"Not when he stops young ladies on the road and catches folks in steel-traps," answered our hero, with a faint smile.

"Well, that's right, too," grumbled the money-lender's son. "Maybe he ought to be in an asylum."

"I think he is on this island now," went on Dave. "His rowboat is here, anyway."

"Say, I'll tell you what we can do!" cried Gus. "Take his boat with us! Then he can't get away, and we can send the authorities over here to get him."

"That's an idea, Gus!" cried Dave. "We'll do it."

"Would that be fair to the man?" asked Nat. "He--er--he might starve to death--or try to swim to sh.o.r.e and get drowned."

"He can't starve to death in one night, and I don't think he'll drown himself. The authorities can come over here early in the morning and round him up, if he is here."

"I--er--I don't think much of your plan," murmured Nat, and seemed much disturbed.

In about a quarter of an hour the boys reached the island sh.o.r.e, at the spot where Nat's motor-boat was tied up. They helped him get in and start up the engine. He had been told how they had come to the island.

"If you want to, you can tie your boat fast to the stern and ride back with me," he said.

"All right, Nat, we'll do it," answered Dave. "It is getting rather late and it's a pretty stiff row to the school."

The motor-craft was started up and sent along in the direction where the boys had left the Oak Hall rowboat. Their course took them past the spot where the wild man's boat had been tied up.

"Why, look, it's gone!" cried Gus, standing up and pointing to the place.

"True enough," answered our hero. "He must have gone off in it while we were up to the cabin."

"He can't be very far away, Dave."

The boys looked up and down the river, but could catch no trace of the missing rowboat or the wild man. In the meantime, the motor-craft was moving forward, where the other boat had been beached among the bushes.

"That is gone, too!" e.j.a.c.u.l.a.t.ed Dave. "He has taken our boat!"

"Oh, do you really think so?" asked Gus. He felt that he was responsible for the craft, as he had taken it from the school boathouse.

"I certainly do think so," said Dave. "It was a neat trick to play."

"It's a wonder he didn't take the motor-boat, too."

"Maybe he didn't know how to run the boat and it was too heavy to start without the engine."

"I guess you are right!" came suddenly from Nat. "Look here!"

He had stooped down to pick something up from the grating on the motor-boat's bottom. If was a torn and dirty bandanna handkerchief.

"The wild man's!" cried Dave. "I remember it."

"I am glad he didn't get away with my boat," returned the money-lender's son, drawing a deep breath. "I'll keep this handkerchief to remember him by."

"Is it marked in any way?" questioned our hero. "Perhaps it has his name or initials on it."

"Oh, I don't think so," returned Nat. "Let us hurry up and get back to the school. If we are late, old Haskers will be after us."

"Go on and run the boat as fast as you please, Nat," answered Dave.

"But I want to look at that handkerchief."

Rather unwillingly, the money-lender's son pa.s.sed the bandanna over.

It was now growing so dark that Dave could see but little.

"Wait, I'll light a match," suggested Gus, and did so, and by the protected but flickering flare our hero looked the handkerchief over.

In one corner there was a faint stamping.

"Looks like 'Rossmore Sanitarium' to me," said Dave, slowly. "Or it may be 'Bossmore' or 'Crossmore.' The beginning is too faded to be sure."

"Bossmore Sanitarium?" queried Nat, and then he became silent and thoughtful. A little later he asked for the bandanna and placed it in his pocket.

The run in the motor-boat to the school dock did not take long. As soon as Nat's craft was properly housed, Dave and Gus a.s.sisted the money-lender's son up the walk and across the campus.

"I suppose I've got to report the loss of the rowboat," said Gus, ruefully.

"It wasn't your fault, Gus," answered Dave. "I'll go with you to Doctor Clay."

"I can't go with my lame foot," put in Nat, and he hobbled up to his dormitory, eyed by several curious students, who wanted to know how he had gotten hurt.

The boys found the master of Oak Hall getting ready for supper. He looked at them inquiringly as they entered his study, in answer to his invitation.

"Well! well!" he exclaimed, after listening to their story. "This is certainly odd! I trust Poole was not seriously hurt."

"I think he was more scared than hurt," answered Dave. "The trap scratched his ankle, that's all. I am sure it is not sprained or broken."

"But the rowboat----" put in Gus. "I didn't mean----"

"Do not worry about that, Plum. It was not your fault. I am glad the wild man did not harm you. I think you got off well. After this you must be careful about how you go out after this remarkable creature."

The master of the school then asked for more particulars of the occurrence, and said he would notify the town authorities about the loss of the rowboat, and ask that a general hunt take place for the wild man.

"They ought to be able to round him up sooner or later," he added.

There was considerable excitement in the school when it was learned that the wild man had been heard of again. The boys looked for the strange individual and so did the town authorities and many farmers, but nothing came of the search. Nat was called on to exhibit the bandanna handkerchief and did so. n.o.body could make out the first part of the name on it, for the handkerchief showed a small hole where the letters should be.

"That is queer," said Dave, to Roger and Phil, when he heard of this.

"That handkerchief did not have a hole there when I looked at it."

"Maybe Nat put the hole there," returned the senator's son.

"Why would he do that?" questioned Phil.