Hall during the two weeks previous to the departure of Mr. Bisbee
for New York.

"Here are, in succession, the finger-prints of the various
servants employed about the house--and of a guest," added Craig,
with a slight change of tone. "They differ markedly from the
finger-prints on the glass," he continued, as one after another
appeared, "all except this last one. That is identical. It is,
Inspector, what we call a composite type of finger-print--in this
case a combination of what is called the 'loop' and 'whorl'
types."

No sound broke the stillness save the sputtering of the oxygen on
the calcium of the stereopticon.

"The owner of the fingers from which these prints were made is in
this room. It was from typhoid germs on these fingers that the
fever was introduced into the drinking water at Bisbee Hall."

Kennedy paused to emphasise the statement, then continued. "I am
now going to ask Dr. Leslie to give us a little talk on a recent
discovery in the field of typhoid fever--you understand,
Commissioner, what I mean, I believe?"

"Perfectly. Shall I mention names?"

"No, not yet."

"Well," began Dr. Leslie, clearing his throat, "within the past
year or two we have made a most weird and startling discovery in