"'Chi. A.'!" exclaimed Orme.

She had taken the paper from the pocket of her coat, and was scanning it closely. "One hundred paces north and two hundred and ten east. 'T.' must mean 'tree.'"

Orme jumped to the ground. He noticed that the university grounds were cut off from the street by an iron fence. There was a gate at the corner by which they had stopped. The gate was not closed. If it were customary to shut it at night, there had been some neglect on this particular evening.

"You'd better go in through the gate," said the girl, "and follow the west fence northward for one hundred paces. Then turn east, at right angles and go two hundred and ten paces--I suppose it must be paces, not feet."

"Yes," said Orme. "That would be the natural way for a burglar in a hurry to measure."

"I will move the car north on Sheridan Road a little way," she went on, "so as not to be in the glare of this street light."

This was the first evidence she had shown of nervousness, and Orme suddenly realized that enemies might be lurking among the trees.

"It might be well for you to take the electric hand-lamp," she added.

"It's in the kit-box, I think."

He looked in the kit-box, but the lamp was not there. He told her so.

"Maku may have stolen it," she said.

Orme slipped a heavy wrench into his pocket and closed the kit-box. With the girl, he avoided any reference to the possible presence of the j.a.panese among the trees, but knowing that he was no match for them unarmed, with their skill in jiu-jitsu, he resolved to be in some measure prepared.

He walked through the gate and began to pace northward, keeping close to the fence and counting his steps. Meantime the car followed his course, moving along the side of the road just west of the fence. Orme counted his hundred paces north, then turned east.

He saw that the two hundred and ten paces which he now had to take would carry him well over toward the lake. The girl evidently had not realized how great the distance would be. She would be nearer him, if she turned back to the corner and followed the Sheridan Road eastward toward the life-saving station, but Orme did not suggest this to her, though the car was within twenty feet of him, the other side of the fence. If there should be a struggle, it would please him just as well that she should be out of hearing, for her anxiety, he knew, was already great, though she kept it closely under control.

Eastward he went through the trees. When he had covered about half the distance he found himself approaching the side of a large building. There must be some mistake. Had he deviated so widely from the course? In leaving the fence he had taken sights as carefully as he could.

Then the explanation struck him. Walsh, the burglar, had probably paced in eastward from the fence and come to the building just as he had. There was no good hiding-place apparent near at hand, and Walsh would hardly have retraced his steps. What, then, would he have done? Orme asked himself. Why, he would have turned north or south.

Orme looked in both directions. North and south of the building were open driveways. Walsh must have gone around the building, then continued eastward. This is what Orme now proceeded to do.

Remembering the number of paces to the side of the building, he chose the northward course, because there was less light north of the building. He hugged the side of the building, counting his steps, and, after reaching the corner, turned eastward. He now counted his paces along the northern side of the building.

When he reached the corner of the eastern side of the building, he paced as far southward on the eastern side as he had gone northward on the western side, and on reaching a point due east of the place at which he had originally come to the building, he added the number of paces from the fence to the building to the number of paces he had taken along the northern side of the building, and continued eastward toward the lake.

At the two hundredth pace he stopped to reconnoiter. Not more than two hundred feet ahead of him he could see dimly, through the tree trunks, the expanse of the lake. There was no sound, no evidence that any other person was near.

He proceeded cautiously for ten paces. Many trees were near him. He would have to examine all of them, for it was hardly possible that he had followed Walsh's course with unerring exactness. If the tree was within twenty feet of him north or south, that was as much as he could expect.

One thing was clear to him. Walsh had probably chosen a tree that could easily be distinguished from the others, either by its size or by some peculiarity of form. Also, the tree must have a hollow place in which the envelope could be concealed. Orme now decided that Walsh must have found his tree first and then paced westward to the fence. The even number, one hundred paces north from the gate, could be only a coincidence.

A little to his left Orme discovered a trunk much larger than its neighbors. It ran up smoothly about eight feet to the first limb. An agile man could easily get up to this limb and pull himself into the branches. A cavity such as are so common in oaks, would furnish a good place for hiding the envelope away.

He looked up. Suddenly a light appeared among the branches. It was a short ray, striking against the trunk. Before Orme could realize what was happening a hand appeared in the little bar of radiance and was inserted apparently into the trunk of the tree. A moment later it was withdrawn.

It held an oblong of white.

Involuntarily Orme took a step forward. A twig cracked under his foot.

Instantly the light went out.

Orme drew the wrench from his pocket and stood tense. There was no other tree quite close enough for the man above him to spring to its branches.

He would have to drop near Orme.

Standing there, the wrench in his hand, Orme felt that the advantage was his. He heard rustlings in the branches above his head and kept himself alert to guard against the man dropping on his shoulders.

To strike the j.a.panese down as he dropped from the tree, that was his plan. But meantime, where was the other j.a.panese? Was he among the near shadows? If so, he might even now be creeping stealthily toward Orme. The likelihood of such an attack was disconcerting to think of. But as Orme was wondering about it, it occurred to him that the man in the tree would not have gone on guard so quickly, if his confederate were near at hand.

It was natural that he should have put the light out, but would he not immediately afterward have given some signal to the friend below? And would he not take it for granted that, were a stranger near, his watcher would have managed to give warning? No, the other j.a.panese could not be on guard.

Perhaps, thought Orme, only one of them had come on this quest. He hoped that this might be the case. He could deal with one.

The man in the tree was taking his own time to descend. Doubtless he would await a favorable moment, then alighting on the ground as far from Orme as possible, make off at top speed.

But now, to Orme's surprise, a figure swung from the lower branch apparently without haste. Once on the ground, however, the stranger leaped toward Orme.

An intuition led Orme to thrust out his left arm. It was quickly seized, but before the a.s.sailant could twist it, Orme struck out with the wrench, which was in his right hand. Swift though the motion was, his opponent threw up his free arm and partly broke the force of the blow. But the wrench reached his forehead nevertheless, and with a little moan, he dropped to the ground in a heap.

As Orme knelt to search the man, another figure swung from the tree and darted northward, disappearing in the darkness. Orme did not pursue--it was useless--but a sickening intuition told him that the man who had escaped was the man who had the envelope.

He struck a match. The man on the ground was moving uneasily and moaning.

There was a scar on his forehead. It was Maku.

He went through the unconscious man's pockets. There was no envelope such as he was looking for, but he did find a folded slip of paper which he thrust into his own pocket. A discovery that interested him, though it was not now important, he made by the light of a second match. It was the marked five-dollar bill. He would have liked to take it as a souvenir, if for no other reason, but time was short and Maku, who evidently was not seriously hurt, showed signs of returning consciousness.

Another occurrence also hastened him. A man was strolling along the lake sh.o.r.e, not far away. Orme had not seen his approach, though he was distinctly outlined against the open background of lake and sky. The stranger stopped. The striking of the two matches had attracted his attention.

"Have you lost something?" he called.

"No," Orme replied.

The man started toward Orme, as if to investigate, and then Orme noticed that outlined on his head was a policeman's helmet.

To be found going through the pockets of an unconscious man was not to Orme's liking. It might be possible to explain the situation well enough to satisfy the local authorities, but that would involve delays fatal to any further effort to catch the man with the envelope.

So he jumped to his feet and ran northward, then turned to the west.

Circling about, he made for the gate at which he had entered. His pursuer either took the wrong lead in the darkness or stopped to examine Maku, if or when Orme went through the gate and doubled back, outside the fence, to the car, there was no sound of steps behind him. He jumped to the chauffeur's seat.

"Well?" inquired the girl, eagerly.

"Too late," said Orme. "I'm sorry. I caught Maku, but the man with the envelope got away."

She laid a hand on his arm. "Are you hurt?" There was unconcealed anxiety in her voice.

To say the things he yearned to say! To be tender to her! But he controlled his feelings and explained briefly what had happened, at the same time throwing on the power and driving the car slowly northward.

"I only know that the fellow ran northward," he said. "He may have worked back or he may have gone on. He may have climbed another tree and waited."

By this time they had come to the northern limits of the grounds, but he had seen no one.