of one or two men who have worked for me and they will probably be able to give you any further information.” He wrote down two or three addresses, and as he put away his pencil, he asked: “How is your colleague, Jervis? He is still with you, I suppose?
“Jervis,” was the reply, “is at present an independent practitioner. He accepted, on my advice, a whole-time appointment at the ‘Griffin’ Life Assurance Office. But he drops in from time to time to lend me a hand. I will tell him you asked after him. And let me tender you my very warmest thanks for your invaluable help today.”
“Tut, tut,” said the professor, “you need not thank me. I am an interested party. If Hollis doesn’t recover his gems, the national collection is going to lose a valuable bequest. Bear that in mind as an additional spur to your endeavours. Good-bye, and good luck!”
With a hearty handshake and a valedictory smile, Professor Eccles let himself out and went his way, apparently in a deeply thoughtful frame of mind, as Thorndyke judged by observing his receding figure from the window.
CHAPTER XIV
THORNDYKE MAKES A BEGINNING
The profound cogitations of Professor Eccles set up in the mind of Thorndyke a sort of induced psychic current. As he turned from the window and began to occupy himself in sorting his material preparatory to examining it, his thoughts were busy with his late visitor. The professor had been about to say something and had suddenly thought better of it. Now, what could it have been that he was about to say? And why had he not said it? And what was the meaning of that strangely intent look that he had bestowed on Thorndyke, and that rather odd expression that his face had borne? And, finally, what were those ‘possibilities’ at which he had hinted?
These were the questions that Thorndyke asked himself as he carried out, quietly and methodically, the preliminaries to his later investigations; with the further questions: Did the professor know anything that bore on the mystery? and if so, what was it that he knew? He evidently had no knowledge either of Woodstock or of Osmond, but he was fairly well acquainted with Hollis. It was manifest that he rejected utterly the alleged robbery from the strong-room; which implied a conviction that the exchange of stones had been made either before the boxes were handed to Woodstock or after they had been received back from him.
It was a perfectly natural and reasonable belief. Mr. Penfield had been of the same opinion. But Mr. Penfield had no special knowledge of the matter. His opinion had been based exclusively on the integrity of the seals. Was this the professor’s case, too? Or was he in possession of some significant facts which he had not disclosed? His manner rather suggested that he was. Perhaps it might be expedient, later, to sound him cautiously. But this would depend on the amount and kind of information that was yielded by other sources.
By the time he reached this conclusion the sorting process was completed. The six boxes with their contents replaced were set out in order, the empties put together as well as was possible, and the seals from the wrapping of each box put into a separate envelope on which the number and description was written. A supply of white paper was laid on the table together with a number of new paper bags, and a little simple microscope which consisted of a watchmaker’s compound eyeglass mounted on a small wooden stand. Thorndyke ran his eye over the collection to see that everything was in order; then, dismissing the professor from his mind, he drew a chair up to the table and fell to work.
He began with the seals. Opening one of the envelopes, he took out the four seals—including that on the knot, which he had cut off—and laying them out on the table, examined them quickly, one after the other. Then he picked up one of them, laid it on a card and placed the card on the stage of the magnifier, through which he made a more prolonged examination, turning the card from time to time to alter the incidence of the light, and jotting down on a note-block a few brief memoranda. The same procedure was followed with the other three seals, and when they had all been examined they were returned to their envelope, the top sheet of the note-block was detached and put in with them, the envelope was put aside and a fresh one opened. Finally he came to the envelope which contained the two impressions that he had, himself, taken from Hollis’s seal, but these were not subjected to the minute scrutiny that the others had received. They were merely laid on the card, slipped under the magnifier, and after a single, brief glance, returned to their envelope and put aside. Next, the seals in the recesses by the keyholes of the boxes were scrutinized, the eyeglass being swung clear of its stand for the purpose, and when this had been done, the fresh set of notes was detached and slipped into one of the envelopes.
But this did not conclude the examination. Apparently there was some further point to be elucidated. Rising from his chair, Thorndyke fetched from a cabinet a microscope of the kind used for examining documents—a heavy-based instrument with a long, pivoted arm and a bull’s-eye condenser. With this he re-examined the seals in succession, beginning with the two impressions that he had, himself, taken; and it might have been noticed that this examination concerned itself exclusively with a particular spot on the seal—a portion of the background just in front of the chariot and above the back of the near horse.
He had just finished and was replacing the microscope in the cabinet when the door opened silently and a small, clerical-looking man entered the room and regarded him benevolently.
“I have laid a cold lunch, sir, in the small room upstairs,” he announced, “and I have put everything ready in your laboratory. Can I help you to carry anything up?” As he spoke, he ran an obviously inquisitive eye over the row of boxes and the numbered envelopes.
“Thank you, Polton,” Thorndyke replied. “I think we will take these things up out of harm’s way and I will just look them over before lunch. But meanwhile there is a small job that you might get on with. I have here a collection of seals of which I want enlarged photographs made—four diameters magnification and each set on a separate negative and numbered similarly to the envelopes.”
He exhibited the collection to his trusty coadjutor with a few words of explanation, when Polton tenderly gathered together the seven envelopes, and master and man betook themselves to the upper regions, each laden with a consignment of Mr. Hollis’s boxes, full and empty.
The laboratory of which Polton had spoken was a smallish room which Thorndyke reserved for his own use, and which was on the same floor as the large laboratory and the workshop over which Polton presided. Its principal features were a long work-bench, covered with polished linoleum and at present occupied by a microscope and a tray of slides, needles, forceps, and other accessories, a side-table, a cupboard, and several sets of shelves.
“Is there anything more, sir?” Polton asked when the boxes had been stacked on the side-table. He looked at them wistfully as he spoke, but accepted with resignation the polite negative and stole out, shutting the door silently behind him As soon as he had gone, Thorndyke fell to work with a rapid but unhurried method suggestive of a fixed purpose and a considered plan. He began by putting on a pair of thin rubber gloves. Then, spreading on the bench a sheet of white demy paper such as chemists use for wrapping bottles, he took one of the boxes, detached its wrapping paper, opened the box, and taking out the jewels and the pads of tissue paper, deposited the former at one end of the bench and the latter at the other, together with the empty box. First he dealt with the pads of tissue paper, one of which he placed on the sheet of white paper, and having opened it out and smoothed it with an ivory paper-knife, examined it closely on both sides with the aid of a reading glass. Then he took from a drawer a large tuning-fork, and holding the packing paper vertically over the middle of the sheet on the bench, he struck the tuning-fork sharply, and while it was vibrating, lightly applied its tip to the centre of the suspended paper, causing it to hum like a gigantic bumble-bee and to vibrate visibly at its edges. Having repeated this proceeding two or three times, he laid the paper aside and with the reading glass inspected the sheet of demy, on which a quite considerable number of minute specks of dust were now to be seen. This procedure he repeated with the other pads of tissue paper from the box, and as he worked, the sheet of white paper on the bench became more and more conspicuously sprinkled with particles of dust until, by the time all the pads had been treated, a quite appreciable quantity of dust had accumulated. Finally, Thorndyke took the box itself and, having opened it, placed its bottom on the sheet of paper and