The detonation that followed startled him out of his self-possession. He dropped the pistol, and was out of the shop and half way across the street before he could recover himself. Then, ashamed of his cowardice, he forced himself to pick up the weapon and went forward to examine the two-inch plank at which he had taken aim. To his astonishment and delight he saw that a hole had been drilled clean through the solid oak and the bullet itself was lying on the ground, flattened from its impact with the masonry behind the planking. All this, let it be said again, was perfectly familiar to Constans in theory, but its realization in fact gave him a strange thrill. A score of men armed with these large caliber pistols, or, better still, rifles, might easily enough compel the surrender or bring about the destruction of the entire fighting force of the Doomsmen. Inspired by this new thought, Constans made a thorough examination of the stock of arms in the shop. To his disappointment he found most of the rifles in unserviceable condition, covered with rust and verdigris. Finally, however, he came across a dozen carbines carefully wrapped and packed for a prospective shipment across the ocean. Protected by their heavy coverings the weapons had suffered comparatively little damage, and Constans spent the best part of a week in cleaning them and getting the mechanism of their working parts into tolerable order. Later on, Constans removed the serviceable ammunition, amounting to several hundred rounds, to a convenient hiding-place in the cellar of a building fronting on the Lesser or Eastern river, and he also transported thither the carbines, the latter carefully wrapped in greased rags to preserve them from dampness. Some day the opportunity would come to put these things to use. And now, February had passed, and March was well into its third quarter; in a few more days the returning sun would cross the line, and spring, the time for action, would be at hand. How he longed for its advent. This was the third occasion upon which Constans had noticed that peculiar noise, a continuous, deep, humming note, such as might have been made by swarming-bees multiplied a hundredfold. On the day that he first heard it he happened to be walking three blocks to the westward of the Citadel Square, and it seemed then that the seat of the mystery lay almost due south. A week later he happened to be in the same locality. Once more, those deep-toned vibrations smote upon his ears; now the sound-waves were all about him and the sense of direction was lost; again, and they plainly proceeded from somewhere to the eastward. It was perplexing, but the varying quarter and strength of the wind might be sufficient to account for the difference, and in one curious particular the two observations corresponded. The day of the week in each case had been Friday, and the humming noise had commenced at precisely the same time--the passing of the sun over the meridian.