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. He had been watching Kennedy in open-eyed amazement and interest.
"Exactly what I am sending Walter to do," he returned. "I have some specially prepared paper that will take those dust marks up and give me a perfect replica."
I hurried back as fast as I could, and Kennedy bent to the task of preserving the marks.
"Have you any idea who might have an object in stealing the dagger?"
Kennedy asked, when he had finished.
Norton shrugged his shoulders. "I believe some weird superstitions were connected with it," he replied. "It had a three-sided blade, and, as I told you, both the blade and the hilt were covered with peculiar markings."
There seemed to be nothing more that could be discovered from a further examination of the Museum. It was plain enough that the thief must have let himself out of a side door which had a spring lock on it and closed itself. Not a mark or scratch was to be found on any of the window or door locks; nothing else seemed to have been disturbed.
Evidently the thief had been after that one, to him priceless, object. Having got it, he was content to get away, leaving untouched the other treasures, some of which were even intrinsically valuable for the metal and precious stones in them. The whole affair seemed so strange to me, however, that, somehow, I could not help wondering whether Norton had told us the whole or only half the story as he knew it about the dagger and its history.
Still talking with the archaeologist, Kennedy and I returned to his laboratory.
We had scarcely reached the door when we heard the telephone ringing insistently. I answered, and it happened to be a call for me. It was the editor of the Star endeavouring to catch me, before I started downtown to the office, in order to give me an assignment.