down to the shore. It was locally known as Sundersley Gap, and was used principally, when used at all, by the farmers’ carts which came down to gather seaweed after a gale.
“What a magnificent stretch of sand!” continued Thorndyke, as we reached the bottom, and stood looking out seaward across the deserted beach. “There is something very majestic and solemn in a great expanse of sandy shore when the tide is out, and I know of nothing which is capable of conveying the impression of solitude so completely. The smooth, unbroken surface not only displays itself untenanted for the moment, but it offers convincing testimony that it has lain thus undisturbed through a considerable lapse of time. Here, for instance, we have clear evidence that for several days only two pairs of feet besides our own have trodden this gap.”
“How do you arrive at the ‘several days’?” I asked.
“In the simplest manner possible,” he replied. “The moon is now in the third quarter, and the tides are consequently neap-tides. You can see quite plainly the two lines of seaweed and jetsam which indicate the high-water marks of the spring-tides and the neap-tides respectively. The strip of comparatively dry sand between them, over which the water has not risen for several days, is, as you see, marked by only two sets of footprints, and those footprints will not be completely obliterated by the sea until the next spring-tide—nearly a week from today.”
“Yes, I see now, and the thing appears obvious enough when one has heard the explanation. But it is really rather odd that no one should have passed through this gap for days, and then that four persons should have come here within quite a short interval of one another.”
“What makes you think they have done so?” Thorndyke asked.
“Well,” I replied, “both of these sets of footprints appear to be quite fresh, and to have been made about the same time.”
“Not at the same time, Jervis,” rejoined Thorndyke. “There is certainly an interval of several hours between them, though precisely how many hours we cannot judge, since there has been so little wind lately to disturb them; but the fisherman unquestionably passed here not more than three hours ago, and I should say probably within an hour; whereas the other man—who seems to have come up from a boat to fetch something of considerable weight—returned through the gap certainly not less, and probably more, than four hours ago.”
I gazed at my friend in blank astonishment, for these events befell in the days before I had joined him as his assistant, and his special knowledge and powers of inference were not then fully appreciated by me.
“It is clear, Thorndyke,” I said, “that footprints have a very different meaning to you from what they have for me. I don’t see in the least how you have reached any of these conclusions.”
“I suppose not,” was the reply; “but, you see, special knowledge of this kind is the stock-in-trade of the medical jurist, and has to be acquired by special study, though the present example is one of the greatest simplicity. But let us consider it point by point; and first we will take this set of footprints which I have inferred to be a fisherman’s. Note their enormous size. They should be the footprints of a giant. But the length of the stride shows that they were made by a rather short man. Then observe the massiveness of the soles, and the fact that there are no nails in them. Note also the peculiar clumsy tread—the deep toe and heel marks, as if the walker had wooden legs, or fixed ankles and knees. From that character we can safely infer high boots of thick, rigid leather, so that we can diagnose high boots, massive and stiff, with nailless soles, and many sizes too large for the wearer. But the only boot that answers this description is the fisherman’s thigh-boot—made of enormous size to enable him to wear in the winter two or three pairs of thick knitted stockings, one over the other. Now look at the other footprints; there is a double track, you see, one set coming from the sea and one going towards it. As the man (who was bow-legged and turned his toes in) has trodden in his own footprints, it is obvious that he came from the sea, and returned to it. But observe the difference in the two sets of prints; the returning ones are much deeper than the others, and the stride much shorter. Evidently he was carrying something when he returned, and that something was very heavy. Moreover, we can see, by the greater depth of the toe impressions, that he was stooping forward as he walked, and so probably carried the weight on his back. Is that quite clear?”
“Perfectly,” I replied. “But how do you arrive at the interval of time between the visits of the two men?”
“That also is quite simple. The tide is now about halfway out; it is thus about three hours since high water. Now, the fisherman walked just about the neap-tide, high-water mark, sometimes above it and sometimes below. But none of his footprints have been obliterated; therefore he passed after high water—that is, less than three hours ago; and since his footprints are all equally distinct, he could not have passed when the sand was very wet. Therefore he probably passed less than an hour ago. The other man’s footprints, on the other hand, reach only to the neap-tide, high-water mark, where they end abruptly. The sea has washed over the remainder of the tracks and obliterated them. Therefore he passed not less than three hours and not more than four days ago—probably within twenty-four hours.”
As Thorndyke concluded his demonstration the sound of voices was borne to us from above, mingled with the tramping of feet, and immediately afterwards a very singular party appeared at the head of the gap descending towards the shore. First came a short burly fisherman clad in oilskins and sou’-wester, clumping along awkwardly in his great sea-boots, then the local police-sergeant in company with my professional rival Dr. Burrows, while the rear of the procession was brought up by two constables carrying a stretcher. As he reached the bottom of the gap the fisherman, who was evidently acting as guide, turned along the shore, retracing his own tracks, and the procession followed in his wake.
“A surgeon, a stretcher, two constables, and a police-sergeant,” observed Thorndyke. “What does that suggest to your mind, Jervis?”
“A fall from the cliff,” I replied, “or a body washed up on the shore.”
“Probably,” he rejoined; “but we may as well walk in that direction.”
We turned to follow the retreating procession, and as we strode along the smooth surface left by the retiring tide Thorndyke resumed:
“The subject of footprints has always interested me deeply for two reasons. First, the evidence furnished by footprints is constantly being brought forward, and is often of cardinal importance; and, secondly, the whole subject is capable of really systematic and scientific treatment. In the main the data are anatomical, but age, sex, occupation, health, and disease all give their various indications. Clearly, for instance, the footprints of an old man will differ from those of a young man of the same height, and I need not point out to you that those of a person suffering from locomotor ataxia or paralysis agitans would be quite unmistakable.”
“Yes, I see that plainly enough,” I said.
“Here, now,” he continued, “is a case in point.” He halted to point with his stick at a row of footprints that appeared suddenly above high-water mark, and having proceeded a short distance, crossed the line again, and vanished where the waves had washed over them. They were easily distinguished from any of the others by the clear impressions of circular rubber heels.
“Do you see anything remarkable about them?” he asked.
“I notice that they are considerably deeper than our own,” I answered.
“Yes, and the boots are about the same size as ours, whereas the stride is considerably shorter—quite a short stride, in fact. Now there is a pretty constant ratio between the length of the foot and the length of the leg, between the length of leg and the height of the person, and between the stature and the length of stride. A long foot means a long leg, a tall man, and a long stride. But here we have a long foot and a short stride. What do you make of that?” He laid down his stick—a smooth partridge cane, one side of which was marked by small lines into inches and feet—beside the footprints to demonstrate the discrepancy.
“The depth of the footprints shows that he was a much heavier man than either of us,”