case. That man did not come all this way merely to drown himself in a ditch. I am quite in the dark at present, so there is nothing for it but to examine everything with our own eyes and see if there is anything that has been overlooked that may throw some light on either the motive or the circumstances. It is always desirable to examine the scene of a crime or a tragedy.”
Here the return of the sergeant put a stop to the discussion and we proceeded on our way in silence. Already we had passed out of the town, and we now turned out of the main road into a lane or by-road, bordered by meadows and orchards and enclosed by rather high hedgerows.
“This is Ponder’s Road,” said the sergeant. “It leads to Renham, a couple of miles farther on, where it joins the Aylesbury Road. The cart track is on the left a little way along.”
A few minutes later we came to our turning, a narrow and rather muddy lane, the entrance to which was shaded by a grove of tall elms. Passing through this shady avenue, we came out on a grass-covered track, broken by deep wagon-ruts and bordered on each side by a ditch, beyond which was a wide expanse of marshy meadows.
“This is the place,” said the sergeant, halting by the side of the right-hand ditch and indicating a spot where the rushes had been flattened down. “It was just as you see it now, only the feet were just visible sticking out of the duck-weed, which had drifted back after Moffet had disturbed it.”
We stood awhile looking at the ditch, with its thick mantle of bright green, spotted with innumerable small dark objects and showing here and there a faint track where a water-vole had swum across.
“Those little dark objects are water-snails, I suppose,” said I, by way of making some kind of remark.
“Yes,” replied Thorndyke; “the common Amber shell, I think—Succinea putris.” He reached out his stick and fished up a sample of the duck-weed, on which one or two of the snails were crawling. “Yes,” he repeated. “Succinea putris it is; a queer little left handed shell, with the spire, as you see, all lop-sided. They have a habit of swarming in this extraordinary way. You notice that the ditch is covered with them.”
I had already observed this, but it hardly seemed to be worth commenting on under the present circumstances—which was apparently the sergeant’s view also, for he looked at Thorndyke with some surprise, which developed into impatience when my colleague proceeded further to expand on the subject of natural history.
“These water-weeds,” he observed, “are very remarkable plants in their various ways. Look at this duck-weed, for instance. Just a little green oval disc with a single root hanging down into the water, like a tiny umbrella with a long handle; and yet it is a complete plant, and a flowering plant, too.” He picked a specimen off the end of his stick and held it up by its root to exhibit its umbrella-like form; and as he did so, he looked in my face with an expression that I felt to be somehow significant; but of which I could not extract the meaning. But there was no difficulty in interpreting the expression on the sergeant’s face. He had come here on business and be wanted to “cut the cackle and get to the hosses.”
“Well, sergeant,” said Thorndyke, “there isn’t much to see, but I think we ought to have a look for those keys. He must have had keys of some kind, if only a latchkey; and they must be in this ditch.”
The sergeant was not enthusiastic. “I’ve no doubt you are right, sir,” said he; “but I don’t see that we should be much forrader if we found them. However, we may as well have a look, only I can’t stay more than a few minutes. I’ve got my work to do at the station.”
“Then,” said Thorndyke, “let us get to work at once. We had better hook out the weed and look it over; and if the keys are not in that, we must try to expose the bottom where the body was lying. You must tell us if we are working in the right place.”
With this he began, with the crooked handle of his stick, to rake up the tangle of weed that covered the bottom of the ditch and drag the detached masses ashore, piling them on the bank and carefully looking them through to see if the keys should chance to be entangled in their meshes. In this work I took my part under the sergeant’s direction, raking in load after load of the delicate, stringy weed, on the pale green ribbon-like leaves of which multitudes of the water-snails were creeping; and sorting over each batch in hopeless and fruitless search for the missing keys. In about ten minutes we had removed the entire weedy covering from the bottom of the ditch over an area of from eight to nine feet—the place which, according to the sergeant, the body had occupied; and as the duck-weed had been caught by the tangled masses of water-weed that we had dragged ashore, we now had an uninterrupted view of the cleared space save for the clouds of mud that we had stirred up.
“We must give the mud a few minutes to settle,” said Thorndyke.
“Yes,” the sergeant agreed, “it will take some time; and as it doesn’t really concern me now that the inquest is over, I think I will get back to the station if you will excuse me.”
Thorndyke excused him very willingly, I think, though politely and with many thanks for his help. When he had gone I remarked, “I am inclined to agree with the sergeant. If we find the keys we shan’t be much forrader.”
“We shall know that he had them with him,” he replied. “Though, of course, if we don’t find them, that will not prove that they are not here. Still, I think we should try to settle the question.”
His answer left me quite unconvinced; but the care with which he searched the ditch and sorted out the weed left me in no doubt that, to him, the matter seemed to be of some importance. However, nothing came of the search. If the keys were there they were buried in the mud, and eventually we had to give up the search and make our way back towards the station.
As we passed out of the lane into Ponder’s Road, Thorndyke stopped at the entrance, under the trees, by a little triangle of turf which marked the beginning of the lane, and looked down at the muddy ground.
“Here is quite an interesting thing, Jervis,” he remarked, “which shows us how standardised objects tend to develop an individual character. These are the tracks of a car, or more probably a tradesman’s van, which was fitted with Barlow tyres. Now there must be thousands of vans fitted with these tyres; they are the favourite type for light covered vans, and when new they are all alike and indistinguishable. Yet this tyre—of the off hind wheel—has acquired a character which would enable one to pick it out with certainty from ten thousand others. First, you see, there is a deep cut in the tyre at an angle of forty-five, then a kidney-shaped ‘Blakey’ has stuck in the outer tyre without puncturing the inner; and finally some adhesive object—perhaps a lump of pitch from a newly-mended road—has become fixed on just behind the ‘Blakey.’ Now, if we make a rough sketch of those three marks and indicate their distance apart, thus “—here he made a rapid sketch in his notebook, and wrote in the intervals in inches—” we have the means of swearing to the identity of a vehicle which we have never seen.”
“And which,” I added, “had for some reason swerved over to the wrong side of the road. Yes, I should say that tyre is certainly unique. But surely most tyres are identifiable when they have been in use for some time.”
“Exactly,” he replied. “That was my point. The standardised thing is devoid of character only when it is new.”
It was not a very subtle point, and as it was fairly obvious I made no comment, but presently reverted to the case of Pedley deceased.
“I don’t quite see why you are taking all this trouble. The insurance claim is not likely to be contested. No one can prove that it was a case of suicide, though I should think no one will feel any
