That person knew of the deadly qualities of too much
phosphorised ether, and painted the gummed flap of the envelope
with several grains of it. The reasoning held good, for Agnes took
the top envelope with its poisoned flap to Miss Blaisdell. No,
there was no chance about that. It was all clever, quick
reasoning."
"But," I objected, "how about the oil of turpentine?"
"Simply to remove the traces of the poison. I think you will see
why that was attempted before we get through."
Kennedy would say no more, but I was content because I could see
that he was now ready to put his theories, whatever they were, to
the final test. He spent the rest of the day working at the
hospital with Dr. Barron, adjusting a very delicate piece of
apparatus down in a special room, in the basement. I saw it, but I
had no idea what it was or what its use might be.
Close to the wall was a stereopticon which shot a beam of light
through a tube to which I heard them refer as a galvanometer,
about three feet distant. In front of this beam whirled a five-
spindled wheel, governed by a chronometer which erred only a
second a day.
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