highway on the left side. Dimly Henry saw objects here
and there which he thought were boulders and clumps of bushes. He saw
no light and stood for a second peering into the darkness, listening
with bated breath. Straight ahead of him he heard the faint purring of
a muffled motor. He knew that he was not many hundred feet behind it
and that this time the car could not escape him. He thrust his
motor-cycle into some near-by bushes, first whipping out his metal
cane. Then he ran speedily but carefully after the car.

Evidently it was moving cautiously. Henry rapidly drew near to it.
When he had come so close that he could see it distinctly, he dropped
to a walk and began to look about, trying to see what was around him.
Here in the field it was lighter than it had been on the highway under
the shadowing trees. The field was, as Henry had guessed, a piece of
wild land, grown up with thickets, with great boulders here and there.
Directly ahead of him was a clump of bushes. Henry hastened to put
them between himself and the car. It was well he did; for hardly had
he gotten behind them before the car stopped and the driver got out.
The car was not more than two hundred feet distant.

Henry dropped to the ground and lay still for a moment. Then he crept,
like an Indian, toward the sheltering thicket. Through it he advanced
until he was not more than fifty feet from the motor-car. He could see
with fair distinctness, but was himself completely concealed. He lay
like a log, watching intently.

The driver unfastened his top and slid it backward. As he did so, his
overcoat caught on the open door and he gave an exclamation of
impatience. When he had laid his top back, he lowered the upper half
of his wind-shield. Then, standing on the running-board, he tugged at
the top of his wind-shield standard. Up came a sliding inner tube. In
a flash the entire mystery stood revealed to Henry. The wind-shield
standard contained a collapsible mast, like the telescoping cane he
held in his hand. Doubtless an aerial was now fastened to the mast.
Somewhere within the car was a wireless outfit. Instead of having many
secret stations, the Germans had this one portable station.

[Illustration: Up came a sliding inner tube]

"How clever!" thought Henry. "And how well they deceived us."

The spy proceeded to run up his mast. It must have reached twenty feet
into the air. And the aerial was dangling from it, too. Evident