iting for
slid quietly by and began to descend the hill toward the ferry.

At once a new fear sprang up in Henry's heart. Suppose the motor-cycle
wouldn't go. Suppose he should be so slow as to miss the ferry-boat.
Desperately he flung open the door and trundled his motor-cycle out to
the street. The roadster was only a block ahead of him. Speedily
Henry pushed the cycle along the road. The motor began to bark and
Henry leaped to the saddle. In another instant he was speeding after
the roadster and was already so near it that he had to jam on his brake
to avoid coming up to it. Near the ferry there was more traffic and
Henry felt relieved. He dropped back a little distance and was almost
completely hidden from the roadster by the carts and cars between them.
So they proceeded to the ferry, the suspected driver bringing his
roadster to a halt near the front of the ferry-boat just as Henry,
following a string of wagons and carts, reached the other end of the
craft. Then the whistle blew and the boat pulled out into the Bay.

But Henry had now no eyes for the sights in the harbor that had
formerly so fascinated him. His entire attention was centred on the
roadster. The driver of the roadster remained in his seat, calmly
looking out over the Bay. Henry stood his machine against a post and
sought a position near by where he was sheltered from the spy's
observation by a huge coal truck, but where he could himself distinctly
see the roadster by peering through the spokes of the truck wheels.
Again he made a mental inventory of the distinguishing features of the
car he was following. And before the ferry-boat reached Manhattan he
could have passed a perfect examination as to the appearance of the
roadster.

It was already dusk when the boat slid into its slip, and the heavy
clouds overhead gave promise of a dark night. Henry was thankful. Up
Broadway he followed the roadster at a safe distance, then up Park Row,
and so to the Brooklyn Bridge. Across this magic structure, one
hundred and fifty feet above the surface of the water, Henry continued
to follow the roadster. The great buildings, piled skyward in huge
masses, were twinkling with a million lights. Boats were coming and
going on the stream below. Electric cars followed one another across
the bridge in endless procession. Elevated railway trains thundered
past unceasingly. Up-stream shone the fairy lights of the other
bridges that span the East Riv