him? He had the money. Instead, he suddenly turns off and walks out into the country. Why this change of plan? What had happened in the interval to cause him to change his plans in this remarkable manner? Had he discovered that he would not be able to replace the money? Even that would not explain his proceedings, for the natural thing would have been to return to the bank and put the notes back.
“Again, if he intended to abscond, why go away across the country on foot? He could easily have taken the train to town and disappeared there. But the idea of his absconding with that small amount of money is difficult to accept: and yet he undoubtedly did walk out into the country. And he has disappeared in a manner which is rather remarkable when one considers how easy a solitary pedestrian is to trace in the country. There is even something rather odd in his leaving the footpath and plunging into the heather, which must have been very inconvenient walking for a fugitive. Taking the case as a whole, I feel that I cannot accept the idea that he simply absconded with stolen money. Why he suddenly changed his plans and made off I am unable to guess, but I am certain that behind his extraordinary proceedings there is something more than meets the eye.”
“That is precisely my feeling,’” said Stalker, and the more so now that I have heard your summing-up of the case. I don’t believe the man set out from home with the idea of absconding. I suspect that something happened after he left the house; that he got some sudden scare that sent him off into the country in that singular fashion. And now I must really take myself off. It has been a great pleasure to talk this case over with you. What about those things of Harold’s? Shall I relieve you of them, now that you have seen them?”
“No,” replied Thorndyke. “Leave them with me for the present. I should like to look them over before I hand them back.”
“You don’t imagine that Harold is right, do you? That these footprints may yield a clue to the man’s disappearance?”
“No. I was not thinking of them in relation to the present case, but in regard to their general evidential bearing. As you know, I have given a great deal of attention and study to footprints. They sometimes yield a surprising amount of information, and as they can be accurately reproduced in the form of plaster casts, or even photographs, they can be produced in court and shown to the judge and the jury, who are thus able to observe for themselves instead of having to rely on the mere statements of witnesses.
“But footprints, as one meets with them in practice, have this peculiarity: that, although they are made in a series, they have to be examined separately as individual things. If we try to examine them on the ground as a series, we have to walk from one to another and trust largely to memory. But in these photographs of Harold’s we can take in a whole series at a glance and compare any one specimen with any other. So what I propose to do is to look over these photographs and see if, apart from the individual characters which identify a footprint, there are any periodic or recurring characters which would make it worth while to use a camera of this type in practice. I want to ascertain, in fact, whether a consecutive series of footprints is anything more than a number of repetitions of a given footprint.”
“I see. Of course, this is not a continuous series. There are long intervals.”
“Yes. That is a disadvantage. Still, it is a series of a kind.”
“True. And the maps?”
“I may as well keep them too. They show the distances between the successive footprints, which may be relevant, since the intervals are not all equal.”
“Very well,” said Stalker, picking up his attache-case. “I admire your enthusiasm and the trouble you take, and I will tell Harold how seriously you take his productions. He will be deeply gratified.”
“It was very good of him to send them, and you must thank him for me.”
The two men shook hands, and when Thorndyke had escorted his guest to the landing and watched him disappear down the stairs, he returned to his chambers, closing the “oak” behind him and thereby secluding himself from the outer world.
CHAPTER VI
DR. THORNDYKE BECOMES INQUISITIVE
Temperamentally, Dr. John Thorndyke presented a peculiarity which, at the first glance, seemed to involve a contradiction. He was an eminently friendly man; courteous, kindly and even genial in his intercourse with his fellow-creatures. Nor was his suave, amicable manner in any way artificial or consciously assumed. To every man his attitude of mind was instinctively friendly, and if he did not suffer fools gladly, he could, on occasion, endure them with almost inexhaustible patience.
And yet, with all his pleasant exterior and his really kindly nature, he was at heart a confirmed solitary. Of all company, his own thoughts were to him the most acceptable. After all, his case was not singular. To every intellectual man, solitude is not only a necessity, it is the condition to which his mental qualities are subject; and the man who cannot endure his own sole society has usually excellent reasons for his objection to it.
Hence, when Thorndyke closed the massive outer door and connected the bell-push with the laboratory floor above, there might have been detected in his manner a certain restfulness. He had enjoyed Stalker’s visit. Particularly had he enjoyed the “queer case,” which was to him what a problem is to an ardent chess player. But still, that was only speculation, whereas with the aid of Harold’s photographs he hoped to settle one or two doubtful points relating to the characters of footprints which had from time to time arisen in his mind, and thereby to extend his actual knowledge.
With a leisurely and thoughtful air he moved a few things on the table to make a clear space, took out from a cupboard a surveyor’s boxwood scale, a pair of needle-pointed spring dividers, a set of paper-weights, a note-block, and a simple microscope (formed of a watchmaker’s doublet mounted on three legs) which he used for examining documents. Then he laid the three sheets of the ordnance map in their proper sequence on the table, with the roll of photographs by their side, drew up a chair and sat down to his task.
He began by running his eye along the path traversed by the fugitive, which was plainly marked by a row of dots, each dot having above it a microscopic number. Dots and numbers had originally been marked with a sharp-pointed pencil, but they had subsequently been inked in with red ink and a fine-pointed pen. From the maps he turned his attention to the photographs, unrolling a length of about nine inches and fixing the strip with a paper-weight at each end. The strip itself was an inch wide, and each photograph was an inch and a half long, and every one of the little oblongs contained the image of a footprint which occupied almost its entire length and which measured—as Thorndyke ascertained by taking the dimensions with his dividers—one inch and three-eighths. Small as the photographs were, they were microscopically sharp in definition, having evidently been taken with a lens of very fine quality; and in the corner of each picture was a minute number in white, which stood out clearly against the rather dark background.
Sliding the little microscope over one of the prints, Thorndyke examined it with slightly amused interest. For a fugitive’s footprint it was a frank absurdity, so strikingly conspicuous and characteristic was it. If Mr. Lewson had had his name printed large upon the soles of his shoes he could hardly have given more assistance to his pursuers. The impression was that of a rubber sole on which, near the toe, was a framed label containing the makers’ name, J. Dell and Co. Behind this was a panel, occupied by a prancing horse, and the Kentish motto, “Invicta,” beneath the panel, implied that this was the prancing horse of Kent. The circular rubber heel was less distinctive, though even this was a little unusual, for its central device was a five-pointed star, whereas most star-pattern heels present six points. But not only were all the details of the pattern distinctly visible; even the little accidental markings, due to wear and damage, could be plainly made out. For instance, a little ridge could be seen across the horse’s neck, corresponding to a cut or split in the rubber sole, and a tiny speck on the heel, which seemed to represent a particle of gravel embedded in the rubber.
When he had made an exhaustive examination of the one photograph, he went back to numbers 1 and 2 which represented the footprints near the back gate of the bank, and which were not for his purpose part of the series. After a brief inspection of them, he placed one