he Professor's own hand.

"On looking next, however, for the medicine-chest, no such thing was to
be discovered in the safe. The laboratory was searched from end to end,
on the chance that some mistake had been made. Still no medicine-chest
was to be found.

"Upon this the Widow Fontaine was questioned. Did she know what had
become of the medicine-chest? She was not even aware that such a thing
existed. Had she been careful to keep the sealed box so safely that no
other person could get at it? Certainly! She had kept it locked in one of
her drawers, and the key in her pocket.

"The lock of the drawer, and the locks of the laboratory door and the
safe, were examined. They showed no sign of having been tampered with.
Persons employed in the University, who were certain to know, were asked
if duplicate keys existed, and all united in answering in the negative.
The medical attendant was examined, and declared that it was physically
impossible for Doctor Fontaine to have left his bed, and visited the
laboratory, between the time of writing his Instructions and the time of
his death.

"While these investigations were proceeding, Doctor Fontaine's senior
assistant obtained leave to examine through a microscope the sealing-wax
left on the box which had contained the keys.

"The result of this examination, and of the chemical analyses which
followed, proved that two different kinds of sealing-wax (both of the
same red color, superficially viewed) had been used on the seal of the
box--an undermost layer of one kind of wax, and an uppermost layer of
another, mingled with the undermost in certain places only. The plain
inference followed that the doctor's sealing-wax had been softened by
heat so as to allow of the opening of the box, and that new sealing-wax
had been afterwards added, and impressed by the Doctor's seal so that the
executor might suspect nothing. Here, again, the evidence of the medical
attendant (present at the time) proved that Doctor Fontaine had only used
one stick of sealing-wax to secure the box. The seal itself was found in
the possession of the widow; placed carelessly in the china tray in which
she kept her rings after taking them off for the night.

"The affair is still under judicial investigation. I will not trouble you
by reporting the further proceedings in detail.

"Of course, Widow Fontaine awaits the result of the investigation with
the composure of conscious innocence. Of course, she has not