Wessex, on the other hand, was watching my friend eagerly, as an earnest student in the class-room might watch a demonstration6 by some celebrated7 lecturer.
“You will notice,” said Paul Harley, “that I have had a number of boards laid down upon the ground yonder, near the sun-dial. They cover a spot where the turf has worn very thin. Now, this garden, because of its sunken position, is naturally damp. Perhaps, Wessex, you would take up these planks8 for me.”
Inspector Wessex obeyed, and Harley, laying the ash stick and cardboard upon the ground, directed the ray of an electric torch upon the spot uncovered.
“The footprints of Colonel Menendez!” he explained. “Here he turned from the tiled path. He advanced three paces in the direction of the sun-dial, you observe, then stood still, facing we may suppose, since this is the indication of the prints, in a southerly direction.”
“Straight toward the Guest House,” muttered Inspector Aylesbury.
“Roughly,” corrected Harley. “He was fronting in that direction, certainly, but his head may have been turned either to the right or to the left. You observe from the great depth of the toe-marks that on this spot he actually fell. Then, here”—he moved the light—“is the impression of his knee, and here again—”
He shone the white ray upon a discoloured patch of grass, and then returned the lamp to his pocket.
“I am going to make a hole in the turf,” he continued, “directly between these two footprints, which seem to indicate that the Colonel was standing9 in the military position of attention at the moment that he met his death.”
“Colonel Menendez,” he went on, “stood rather over six feet in his shoes. The stick which now stands upright in the turf measures six feet, from the chalk mark up to which I have buried it to the slot which I have cut in the top. Into this slot I now wedge my sheet of cardboard.”
As he placed the sheet of cardboard in the slot which he had indicated, I saw that a round hole was cut in it some six inches in diameter. We watched these proceedings11 in silence, then:
“If you will allow me to adjust the candle, gentlemen,” said Harley, “which has burned a little too low for my purpose, I shall proceed to the second part of this experiment.”
He walked up to the yew tree, and by means of bending the nail upward he raised the flame of the candle level with the base of the embedded12 bullet.
“By heavens!” cried Wessex, suddenly divining the object of these proceedings, “Mr. Harley, this is genius!”
“Thank you, Wessex,” Harley replied, quietly, but nevertheless he was unable to hide his gratification. “You see my point?”
“Certainly.”
“In ten minutes we shall know the truth.”
“Oh, I see,” muttered Inspector Aylesbury; “we shall know the truth, eh? If you ask me the truth, it’s this, that we are a set of lunatics.”
“My dear Inspector Aylesbury,” said Harley, good humouredly, “surely you have grasped the lesson of experiment number one?”
“Well,” admitted the other, “it’s funny, certainly. I mean, it wants a lot of explaining, but I can’t say I’m convinced.”
“That’s a pity,” murmured Wessex, “because I am.”
“You see, Inspector,” Harley continued, patiently, “the body of Colonel Menendez as it lay formed a straight line between the sun-dial and the hut in the garden of the Guest House. That is to say: a line drawn2 from the window of the hut to the sun-dial must have passed through the body. Very well. Such an imaginary line, if continued beyond the sun-dial, would have terminated near the base of the seventh yew tree. Accordingly, I naturally looked for the bullet there. It was not there. But I found it, as you know, in the ninth tree. Therefore, the shot could not possibly have been fired from the Guest House, because the spot in the ninth yew where the bullet had lodged13 is not visible from the Guest House.”
Inspector Aylesbury removed his cap and scratched his head vigorously.
“In order that we may avoid waste of valuable time,” said Harley, finally, “let us take a hasty observation from here. As a matter of fact, I have done so already, as nearly as was possible, without employing this rough apparatus14.”
He knelt down beside the yew tree, lowering his head so that the candlelight shone upon the brown, eager face, and looked upward, over the top of the sun-dial and through the hole in the cardboard.
“Yes,” he muttered, a note of rising excitement in his voice. “As I thought, as I thought. Come, gentlemen, let us hurry.”
He walked rapidly out of the garden, and up the steps, whilst we followed dumb with wonder—or such at any rate was the cause of my own silence.
In the hall Pedro was standing, a bunch of keys in his hand, and evidently expecting Harley.
“Will you take us by the shortest way to the tower stairs?” my friend directed.
“Yes, sir.”
Doubting, wondering, scarcely knowing whether to be fearful or jubilant, I followed, along a carpeted corridor, and thence, a heavy, oaken door being unlocked, across a dusty and deserted15 apartment apparently16 intended for a drawing room. From this, through a second doorway17 we were led into a small, square, unfurnished room, which I knew must be situated18 in the base of the tower. Yet a third door was unlocked, and:
“Here is the stair, sir,” said Pedro.
In Indian file we mounted to the first floor, to find ourselves in a second, identical room, also stripped of furniture and decorations. Harley barely glanced out of the northern window, shook his head, and:
“Next floor, Pedro,” he directed.
Up we went, our footsteps arousing a cloud of dust from the uncarpeted stairs, and the sound of our movements echoing in hollow fashion around the deserted rooms.
Gaining the next floor, Harley, unable any longer to conceal19 his excitement, ran to the north window, looked out, and:
“Gentlemen,” he said, “my experiment is complete!”
He turned, his back to the window, and faced us in the dusk of the room.
“Assuming the ash stick to represent the upright body of Colonel Menendez,” he continued, “and the sheet of cardboard to represent his head, the hole which I have cut in it corresponds fairly nearly to the position of his forehead. Further assuming the bullet to have illustrated20 Euclid’s definition of a straight line, such a line, followed back from the yew tree to the spot where the rifle rested, would pass through the hole in the cardboard! In other words, there is only one place from which it is possible to see the flame of the candle through the hole in the cardboard: the place where the rifle rested! Stand here in the left-hand angle of the window and stoop down! Will you come first, Knox?”
I stepped across the room, bent21 down, and stared out of the window, across the Tudor garden. Plainly I could see the sun-dial with the ash stick planted before it. I could see the piece of cardboard which surmounted22 it—and, through the hole cut in the cardboard, I could see the feeble flame of the candle nailed to the ninth yew tree!
I stood upright, knowing that I had grown pale, and conscious of a moist sensation upon my forehead.
“Merciful God!” I said in a hollow voice. “It was from this window that the shot was fired which killed him!”
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1
withdrawn
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| vt.收回；使退出；vi.撤退，退出 | |
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drawn
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| v.拖，拉，拔出；adj.憔悴的，紧张的 | |
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3
inspector
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| n.检查员，监察员，视察员 | |
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4
yew
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| n.紫杉属树木 | |
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5
underlay
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| v.位于或存在于（某物）之下( underlie的过去式 )；构成…的基础（或起因），引起n.衬垫物 | |
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6
demonstration
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| n.表明，示范，论证，示威 | |
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7
celebrated
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| adj.有名的，声誉卓著的 | |
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8
planks
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| （厚）木板( plank的名词复数 )； 政纲条目，政策要点 | |
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9
standing
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| n.持续，地位；adj.永久的，不动的，直立的，不流动的 | |
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10
pointed
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| adj.尖的，直截了当的 | |
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11
proceedings
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| n.进程，过程，议程；诉讼(程序)；公报 | |
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12
embedded
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| a.扎牢的 | |
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13
lodged
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| v.存放( lodge的过去式和过去分词 )；暂住；埋入；（权利、权威等）归属 | |
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14
apparatus
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| n.装置，器械；器具，设备 | |
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15
deserted
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| adj.荒芜的，荒废的，无人的，被遗弃的 | |
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16
apparently
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| adv.显然地；表面上，似乎 | |
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17
doorway
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| n.门口，(喻)入门；门路，途径 | |
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18
situated
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| adj.坐落在...的，处于某种境地的 | |
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19
conceal
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| v.隐藏，隐瞒，隐蔽 | |
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20
illustrated
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| adj. 有插图的，列举的 动词illustrate的过去式和过去分词 | |
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21
bent
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| n.爱好，癖好；adj.弯的；决心的，一心的 | |
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22
surmounted
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| 战胜( surmount的过去式和过去分词 )； 克服（困难）； 居于…之上； 在…顶上 | |
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