Some have circles,
others a very different series of pits and elevations, a set of
characters when examined and measured under the microscope utterly
different from those in every other case. Each is unique, in its
pits, lines, circles and irregularities. The laws of chance are as
much against two of them having the same markings as they are
against the thumb prints of two human subjects being identical.
The firing-pin theory, which was used in a famous case in Maine,
is just as infallible as the finger-print theory. In this case
when we find the owner of the gun making an 'L' mark we shall have
the murderer."
Something, I could see, was working on O'Connor's mind. "That's
all right," he interjected, "but you know in neither case was the
victim shot to death. They were asphyxiated."
"I was coming to that," rejoined Craig. "You recall the peculiar
marking on the nose of those bullets? They were what is known as
narcotic bullets, an invention of a Pittsburg scientist. They have
the property of lulling their victims to almost instant slumber.
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