Sherlock Holmes and the King's Evil: And Other New Tales Featuring the World's Greatest Detective
what you have told us, I have every confidence that the riddle of your brothers’ disappearance will be resolved within the next three days.”
    “Of what possible use to you can a muddy pebble be?”
    “Had it not been wrapped with such care, I should probably have thought it of no use whatever. However, such careful treatment reminds me that this is hard stone, though it came apparently from a bed of soft clay to which it did not belong. I do not call that conclusive of anything—but in the light of all the other evidence it is suggestive of something.”

2

    T hat evening, after we had seen Miss Chastelnau safely to her train, Sherlock Holmes ate his dinner from a tray beside him on his work-table. The table’s disreputable surface was stained by hydrochloric acid and the results of numerous chemical “experiments.” Scattered upon it now lay a lens and a pair of forceps, a stained penknife in a butter-dish, and a medical scalpel. A dismembered revolver had awaited his attention for two or three weeks. Close at hand were two skulls, whose owners had been hanged for murder at Tyburn a century ago and publicly dissected before a large public audience at Surgeons Hall. These two macabre fetishes now acted as book-ends for a brief row of well-thumbed reference volumes, required for immediate purposes. My friend had exchanged his formal black coat for the familiar purple of his dressing-gown.
    It was after ten o’clock and his long back was curved once again over the Chastelnau pebble, as I had better call it. He had been examining it for several minutes by the aid of a jeweller’s lens screwed into his eye. Removing this eyepiece, he straightened in his chair.
    “I believe we can do better, Watson. We are no common high street supplier of watches and bijouterie.”
    He had scarcely spoken a word since we had returned from escorting our visitor to King’s Cross Station and he had certainly not invited conversation in the half hour since our return. Rising from his chair, he now went across to his “natural sciences” cupboard and drew out a piece of apparatus. This was a hydroscopic balance, cased in mahogany and stamped along its base in gold, “E. Dertling, London.” He sat down and placed it in front of him.
    The device resembled an open-sided box of polished wood about ten inches in height, twelve inches long and six inches deep. Within it, the pivot of a brass balance was screwed to the centre of its floor. A minute weighing pan was suspended to either side of this. From the lower edge of the box protruded a small brass knob for the alignment of the scales. This had been calibrated to calculate weights to within one milligram.
    “I believe we may allow for a room temperature of sixty degrees Fahrenheit, Watson. Would that be your guess?”
    This was conversation at last.
    “Certainly no lower than that, with the fire glowing as it is and the curtains closed.”
    Holmes took Miss Chastelnau’s pebble. With a fine brush he worked over its surface to displace any loose substance that might still have adhered to it. Then, placing it in a loop of thin wire which was suspended from the pan on the right hand of the balance, he adjusted the mechanism and noted the weight of it in air. Next, taking the pebble with a pair of tweezers, he placed a small jar of water under the right-hand scale-pan, so that when he lowered the pan the pebble was immersed. Almost as an afterthought, he dipped the slender brush into the jar and went over the stone again, apparently to dislodge any bubbles of air which might give buoyancy to so small an object.
    As I watched the intensity with which my friend worked I could not help thinking that Sherlock Holmes seemed less like the great consulting detective of Baker Street than a like happy child on Christmas Morning. Perhaps there was a slighter difference between the two types than I had supposed. Now he took his brass propelling pencil and made several notes on the immaculate starch

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