"If I'm not mistaken," he went on, "your thief got into the Museum
during the daytime, and, when no one was looking, hid here. He
must have stayed until the place was locked up at night. Then he
could rob at his leisure, only taking care to confine his
operations to the time between the rather infrequent rounds of the
night watchman."
Kennedy bent down again. "Look," he indicated. "There are the
marks of shoes in the dust, shoes with nails in the heels, of
course. I shall have to compare the marks that I have found here
with those I have collected, following out the method of the
immortal Bertillon. Every make of shoes has its own peculiarities,
both in the number and the arrangement of the nails. Offhand,
however, I should say that these shoes were American-made--though
that, of course, does not necessarily mean that an American wore
them. I may even be able to determine which of a number of
individual pairs of shoes made the marks. I cannot tell that yet,
until I study them. Walter, I wish you'd go over to my laboratory.
In the second right-hand drawer of my desk you'll find a package
of paper. I'd like to have it."
"Don't you think you ought to preserve the marks?" I heard Norton
hint, as I left.
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