When he withdrew the note, there was writing on both sides, the black
of the original note and something in red on the other side.

We crowded around, and Craig read it with as much interest as any of
us:

"Before taking the headache-powder, be sure to place the contents of
this paper in a jar with a little warm water."

"Hum," commented Craig, "this was apparently written on the outside
wrapper of a paper folded about some sal-ammoniac and quicklime. It
goes on:

* * * * *

"'Just drop the whole thing in, _paper and all_. Then if you feel a
faintness from the medicine the ammonia will quickly restore you. One
spoonful of the headache-powder swallowed quickly is enough.'"

* * * * *

No name was signed to the directions, but they were plainly written,
and "_paper and all_" was underscored heavily.

Craig pulled out some letters. "I have here specimens of writing of
many persons connected with this case, but I can see at a glance which
one corresponds to the writing on this red death-warrant by an
almost inhuman fiend. I shall, however, leave that part of it to the
handwriting experts to determine at the trial. Thurston, who was the
man whom you saw enter the Boncour bungalow as you left--the constant
visitor?"

Thurston had not yet regained his self-control, but with trembling
forefinger he turned and pointed to Halsey Post.

"Yes, ladies and gentlemen," cried Kennedy as he slapped the telegram
that had just come from New York down on the table decisively, "yes,
the real client of Kerr & Kimmel, who bent Thurston to his purposes,
was Halsey Post, once secret lover of Vera Lytton till threatened by
scandal in Danbridge--Halsey Post, graduate in technology, student
of sympathetic inks, forger of the Vera Lytton letter and the other
notes, and dealer in cyanides in the silver-smithing business,
fortune-hunter for the Willard millions with which to recoup the Post
& Vance losses, and hence rival of Dr. Dixon for the love of Alma
Willard. That is the man who wielded the poisoned pen. Dr. Dixon is
innocent."

THE INVISIBLE RAY

BY ARTHUR B. REEVE

"I won't deny that I had some expectations from the old man myself."

Kennedy's client was speaking in a low, full-chested, vibrating voice,
with some emotion, so low that I had entered the room without being
aware that any one was there until it was too late to retreat.

"As his physician f