gas. I thought I knew the smell the moment I got a whiff of it.
Besides, I could tell by the jaundiced look of his face that he
was being poisoned. His liver was out of order, and arsenic seems
to accumulate in the liver."

"Slowly poisoned by minute quantities of gas," I repeated in
amazement. "Some one in that Red Brotherhood is a diabolical
genius. Think of it--poisoned wall-paper!"

It was still early in the forenoon when Kennedy excused himself,
and leaving me to my own devices disappeared on one of his
excursions into the underworld of the foreign settlements on the
East Side. About the middle of the afternoon he reappeared. As far
as I could learn all that he had found out was that the famous, or
rather infamous, Professor Michael Kumanova, one of the leaders of
the Red Brotherhood, was known to be somewhere in this country.

We lost no time in returning again to Woodrock late that
afternoon. Craig hastened to warn Brixton of his peril from the
contaminated atmosphere of the den, and at once a servant was set
to work with a vacuum cleaner.

Carefully Craig reconnoitred the basement where the eavesdropping
storeroom was situated. Finding it deserted, he quickly set to
work connecting the two wires of the general household telephone
with what looked very much like a seamless iron tube, perhaps six
inches long and three inches in diameter. Then he connected the
tube also with the private wire of Brixton in a similar manner.

"This is a special repeating-coil of high efficiency," he