the window-frame so that the nail dangled against the glass. Then,
holding the free end of the long string, he and Ted withdrew to the
shadow of some lilac bushes.

"All ready?" asked Ted.

"Sure. Here she goes!"

Bob then gently jerked the string. This swung the nail to and fro,
and it tapped on the window-pane as if some one was throwing
pebbles against the glass. This was kept up for several seconds.

The widow, who was reading in the dining-room, heard the tapping at
the glass. It startled her at first, and then, thinking some one
might be at the door, she conquered her nervousness and opened the
portal. Of course she saw no one, and the string was not observed.
Neither were the boys, hidden in the bushes.

"We fooled her," chuckled Ted, for they could see all that happened.

"Sure we did," added Bob. "Wait till she goes in and we'll do it
some more."

Somewhat puzzled, the Widow Mooney closed the door. No sooner was
she back in the dining-room than the tapping at the pane was
resumed. This time it was louder. The widow, who was quite timid
and nervous, felt frightened. She had years before believed in
spirits, and she had not altogether gotten over this.

Once more she went to the door, the boys observing her from their