that
Drysdale would surely confess in a short time, I returned to Chicago,
leaving the whole charge of the operation with Andrews.

A few nights later Mrs. Potter was troubled with the tooth-ache, and she
lay awake most of the night. Suddenly she heard footsteps in Drysdale's
room, and then she saw Drysdale pass her window on the veranda. He was
dressed in slippers and night-dress, and his actions were so strange
that she determined to follow him. Hastily putting on some dark clothes,
she hurried cautiously after him. The night was clear with no moon, and
she was able to distinguish his white figure at a considerable distance.
He walked rapidly to the creek and followed its windings a short
distance; then he paused a few minutes, as if reflecting. This enabled
Mrs. Potter to hide herself near by in some undergrowth, whence she
could watch him more carefully. To her great astonishment, she saw him
walk into the creek at a shallow spot, and begin wading up against the
current. Very soon he stopped and leaned over with his hands in the
water, as if he were feeling for something. In a few minutes he came out
of the stream, on the opposite side from that on which he had entered,
and took a path to a footbridge leading across the creek toward his
house. As soon as she saw that he was on his way back, she hastened home
as rapidly as possible, arriving there only a few seconds before him.

The next morning, Drysdale appeared at the breakfast table for the first
time, in several days. He remarked that he felt much better, but he said
nothing of his midnight walk, nor did his wife, as she had slept in a
separate room; however, she was probably ignorant of it.

Neither Mrs. Potter, nor Mr. Andrews could imagine what Drysdale's
object was in making his pilgrimage to the creek at that time of night,
especially as he had always shown the greatest aversion to that
vicinity, ever since he had first seen the ghost. I was equally puzzled
when I was informed of his freak, but I determined to make use of the
incident, in case he should do the same thing again. I therefore
instructed Andrews to have Green watch the house every night, dressed in
his apparition suit. He was then to "shadow" Drysdale, when the latter
went out, and if a favorable opportunity should present itself, he was
to appear before him in full view in the role of the ghost.

By this time, Drysdale had recovered sufficiently, to attend to his
office duties, but he alway