"My first idea," Thorndyke resumed, "was that John Blackmore, taking advantage of the mental enfeeblement produced by the opium habit, had dictated this will to Jeffrey, It was then that I sought permission to inspect Jeffrey's chambers; to learn what I could about him and to see for myself whether they presented the dirty and disorderly appearance characteristic of the regular opium-smoker's den. But when, during a walk into the City, I thought over the case, it seemed to me that this explanation hardly met the facts. Then I endeavoured to think of some other explanation; and looking over my notes I observed two points that seemed worth considering. One was that neither of the witnesses to the will was really acquainted with Jeffrey Blackmore; both being strangers who had accepted his identity on his own statement. The other was that no one who had previously known him, with the single exception of his brother John, had ever seen Jeffrey at the inn.

"What was the import of these two facts? Probably they had none. But still they suggested the desirability of considering the question: Was the person who signed the will really Jeffrey Blackmore? The contrary supposition—that some one had personated Jeffrey and forged his signature to a false will—seemed wildly improbable, especially in view of the identification of the body; but it involved no actual impossibility; and it offered a complete explanation of the, otherwise inexplicable, coincidences that I have mentioned.

"I did not, however, for a moment, think that this was the true explanation, but I resolved to bear it in mind, to test it when the opportunity arose, and consider it by the light of any fresh facts that I might acquire.

"The new facts came sooner than I had expected. That same evening I went with Dr. Jervis to New Inn and found Mr. Stephen in the chambers. By him I was informed that Jeffrey was a learned Orientalist, with a quite expert knowledge of the cuneiform writing; and even as he was telling me this, I looked over his shoulder and saw a cuneiform inscription hanging on the wall upside down.

"Now, of this there could be only one reasonable explanation. Disregarding the fact that no one would screw the suspension plates on a frame without ascertaining which was the right way up, and assuming it to be hung up inverted, it was impossible that the misplacement could have been overlooked by Jeffrey. He was not blind, though his sight was defective. The frame was thirty inches long and the individual characters nearly an inch in length—about the size of the D 18 letters of Snellen's test-types, which can be read by a person of ordinary sight at a distance of fifty-five feet. There was, I repeat, only one reasonable explanation; which was that the person who had inhabited those chambers was not Jeffrey Blackmore.

"This conclusion received considerable support from a fact which I observed later, but mention in this place. On examining the soles of the shoes taken from the dead man's feet, I found only the ordinary mud of the streets. There was no trace of the peculiar gravelly mud that adhered to my own boots and Jervis's, and which came from the square of the inn. Yet the porter distinctly stated that the deceased, after paying the rent, walked back towards his chambers across the square; the mud of which should, therefore, have been conspicuous on his shoes.

"Thus, in a moment, a wildly speculative hypothesis had assumed a high degree of probability.

"When Mr. Stephen was gone, Jervis and I looked over the chambers thoroughly; and then another curious fact came to light. On the wall were a number of fine Japanese colour-prints, all of which showed recent damp-spots. Now, apart from the consideration that Jeffrey, who had been at the trouble and expense of collecting these valuable prints, would hardly have allowed them to rot on his walls, there arose the question: How came they to be damp? There was a gas stove in the room, and a gas stove has at least the virtue of preserving a dry atmosphere. It was winter weather, when the stove would naturally be pretty constantly alight. How came the walls to be so damp? The answer seemed to be that the stove had not been constantly alight, but had been lighted only occasionally. This suggestion was borne out by a further examination of the rooms. In the kitchen there were practically no stores and hardly any arrangements even for simple bachelor cooking; the bedroom offered the same suggestion; the soap in the wash-stand was shrivelled and cracked; there was no cast-off linen, and the shirts in the drawers, though clean, had the peculiar yellowish, faded appearance that linen acquires when long out of use. In short, the rooms had the appearance of not having been lived in at all, but only visited at intervals.

"Against this view, however, was the statement of the night porter that he had often seen a light in Jeffrey's sitting-room at one o'clock in the morning, with the apparent implication that it was then turned out. Now a light may be left in an empty room, but its extinction implies the presence of some person to extinguish it; unless some automatic device be adopted for putting it out at a given time. Such a device—the alarm movement of a clock, for instance, with a suitable attachment—is a simple enough matter, but my search of the rooms failed to discover anything of the kind. However, when looking over the drawers in the bedroom, I came upon a large box that had held a considerable quantity of hard stearine candles. There were only a few left, but a flat candlestick with numerous wick-ends in its socket accounted for the remainder.

"These candles seemed to dispose of the difficulty. They were not necessary for ordinary lighting, since gas was laid on in all three rooms. For what purpose, then, were they used, and in such considerable quantities? I subsequently obtained some of the same brand—Price's stearine candles, six to the pound—and experimented with them. Each candle was seven and a quarter inches in length, not counting the cone at the top, and I found that they burned in still air at the rate of a fraction over one inch in an hour. We may say that one of these candles would burn in still air a little over six hours. It would thus be possible for the person who inhabited these rooms to go away at seven o'clock in the evening and leave a light which would burn until past one in the morning and then extinguish itself. This, of course, was only surmise, but it destroyed the significance of the night porter's statement.