I opened it.
"Is Professor Kennedy here?" I heard a voice inquire. "I'm one of
the orderlies at the City Hospital, next to the Morgue, where Dr.
Leslie has his laboratory. I've a message for Profesor Kennedy, if
he's in."
Kennedy took the envelope, which bore the stamp of Dr. Leslie's
department, and tore it open.
"My dear Kennedy," he read, in an undertone. "I've been engaged in
investigating that poison which probably surrounds the wound in
the Mendoza case, but as yet have nothing to report. It is
certainly none of the things which we ordinarily run up against.
Enclosed you will find a slip of paper and the envelope which it
came in--something, I take it, that has been sent me by a crank.
Would you treat it seriously or disregard it? Leslie."
As Kennedy had unfolded Leslie's own letter a piece of paper had
fluttered to the floor. I picked it up mechanically, and only now
looked at it, as Craig finished reading.
On it was another copy of the threat that had been sent to both
Norton and myself!
The hospital orderly had scarcely gone when another tap came at
the door.
"Your books from the library, Professor," announced a student who
was employed in the library as part payment of his tuition.
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