She expected to see him fall. But nothing happened. Long Sin
laughed. It was an Oriental trick knife in which the blade
telescoped into the handle.
"Look at it," he added, handing it to her.
Long Sin took a bladder of water from a table nearby and concealed
it under his coat. "Now, you stab me," he directed.
Mary hesitated. But he repeated the command and she plunged the
knife gingerly at him. It telescoped. He made her try it over and
she stabbed more resolutely. The water from the bladder poured
out.
"Good!" cried Long Sin, much pleased. "Now," he added, seating
himself beside her, "I want you to lure Elaine here."
Mary looked at him inquiringly as he returned the knife to its
scabbard on the wall. "Remember where it is," he continued. "Now,
if you will come into the other room I will show you how to get
her."
I had been amusing myself by rigging up a contrivance by which I
could make it possible to see through or rather over, a door. The
idea had been suggested to me by the cystoscope which physicians
use in order to look down one's throat, and I had calculated that
by using three mirrors placed at proper angles, I could easily
reflect rays down to the level of my eye.
Kennedy, who had been busy in the other end of the laboratory,
happened to look over in my direction. "What's the big idea,
Walter?" he asked.
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