.

"That," said Kennedy, "is a little instrument called the microphone.
Its chief merit lies in the fact that it will magnify a sound sixteen
hundred times, and carry it to any given point where you wish to place
the receiver. Originally this device was invented for the aid of the
deaf, but I see no reason why it should not be used to aid the law.
One needn't eavesdrop at the keyhole with this little instrument about.
Inside that box there is nothing but a series of plugs from which wires,
much finer than a thread, are stretched taut. Yet a fly walking near it
will make a noise as loud as a draft-horse. If the microphone is placed
in any part of the room, especially if near the persons talking--even if
they are talking in a whisper--a whisper such as occurred several times
during the evening and particularly while I was in the next room getting
the notes made by my stenographer--a whisper, I say, is like shouting
your guilt from the housetops.

"You two men, Close and Lawrence, may consider yourselves under arrest
for conspiracy and whatever other indictments will lie against such
creatures as you. The police will be here in a moment. No, Close,
violence won't do now. The doors are locked--and see, we are four to
two."

V. The Seismograph Adventure

"Dr. James Hanson, Coroner's Physician, Criminal Courts Building," read
Craig Kennedy, as he held a visitor's card in his hand. Then to the
visitor he added, "Take a chair, Doctor."

The physician thanked him and sat down. "Professor Kennedy," he began,
"I have been referred to you by Inspector O'Connor of the Detective
Bureau. It may seem an impertinence for a city official to call on you
for assistance, but--well, you see, I'm completely floored. I think,
too, that the case will interest you. It's the Vandam case."

If Dr. Hanson had suddenly turned on the current of an induction coil
and I had been holding the handles I don't think the thrill I received
could have been any more sudden. The Vandam case was the sensation of
the moment, a triple puzzle, as both Kennedy and myself had agreed. Was
it suicide, murder, or sudden death? Every theory, so far, had proved
unsatisfactory.

"I have read only what the newspapers have published," replied Craig to
the doctor's look of inquiry. "You see, my friend Jameson here is on the
staff of the Star, and we are in the habit of discussing these cases."

"Very glad to meet you, Mr. Jameson," exclaimed Dr. Hanson at the