"Very well, Mr. Underhill; it is now five minutes to noon, and I think that I will be able to show you in exactly five minutes." He took from his pocket a leather case, such as a woodsman might use to carry a large pocket compass, and removing the cover set out upon the table an instrument that was entirely enclosed in vulcanized rubber. On the top, under glass, was a dial, with a little needle which vibrated violently, but came to a standstill soon after being placed on the table. Two small platinum wires, about twelve inches long and carefully insulated, issued from opposite sides of the hard rubber casing. Underhill's face at first bore only an expression of mild amusement, but as Edestone evidenced such a deadly earnestness, he showed more interest and said with a rather nervous laugh: "Look here, old chap, don't blow the entire English navy out of the water while you're closeted here with me. I must have some witness to prove that I didn't do it or I might have to explain to the House of Commons." Edestone, a hard and drawn look about his mouth, paid no heed, but taking his watch out of his pocket fixed his eye on the little needle of the instrument and waited as the last few seconds of the hour ticked off. As the second hand made its last round, and the minute hand swung into position exactly at twelve, he leaned over the table as if trying by mental suggestion to make the instrument respond to his will. But it remained perfectly quiescent, and with a half sigh and a tightening of the lines about his mouth, he closed his watch. Could it be possible, he thought, that "Specs" had forgotten his instructions always to use Greenwich time? He was about to replace the instrument in its case, when he was startled by a clock on the mantel, which began to strike the hour of twelve. Involuntarily he counted the strokes as they chimed slowly, and as the vibrations of the last stroke faded away the little needle swung an entire circuit of the dial, returning to its original position. This was repeated three times. Underhill, although still interested in what was going on, seemed a bit relieved when nothing more startling happened. "Oh, I say, you know, you gave me quite a start," he jested. "I thought that you were going to set London on fire, and you simply seem to be taking your blood-pressure." Edestone still paid not the slightest attention to him, but after glancing about the room walked over to the mantelpiece where he picked up an old twelve-inch cannon-ball, which with considerable difficulty he brought back and placed on the table by the side of his instrument. His eyes once more roved about the room as if he were seeking something, and stepping deliberately to a passe-partout photograph of King George V., he ripped off the binding with his