We, too, had
riveted our eyes on the tubes.
As he added the serum from the inoculated rabbit, a cloudy milky
ring formed almost immediately in the hitherto colourless, very
dilute blood-solution.
"That," concluded Craig, triumphantly holding the tube aloft,
"that conclusively proves that the little round spot on the
hardwood floor was not paint, was not anything in this wide world
but blood."
No one in the room said a word, but I knew there must have been
someone there who thought volumes in the few minutes that
elapsed.
"Having found one blood-spot, I began to look about for more, but
was able to find only two or three traces where spots seemed to
have been. The fact is that the blood spots had been apparently
carefully wiped up. That is an easy matter. Hot water and salt,
or hot water alone, or even cold water, will make quite short
work of fresh blood-spots--at least to all outward appearances.
But nothing but a most thorough cleaning can conceal them from
the Uhlenhuth test, even when they are apparently wiped out. It
is a case of Lady Macbeth over again, crying in the face of
modern science, 'Out, out, damned spot.'
"I was able with sufficient definiteness to trace roughly a
course of blood-spots from the fireplace to a point near the door
of the living-room.
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