After this portion of the work had been completed--and all three of the moonlighters moved as rapidly as possible, lest Mr. Newcombe should put in an appearance--the task of filling the shells was begun. The tops of the long tin tubes were removed, and into these rather frail shells the glycerine was poured, Bob handling it as if it was no more dangerous than the petroleum they hoped to find. As fast as each tube or cartridge was filled it was lowered into the well by the stout wire bail that was fastened to the top, and just under the cover was the hammer which would explode the percussion cap when struck. These cartridges were pointed at the head, and since the point of the second would rest on the top of the first, and the third on the second, the blow which exploded the first would naturally be communicated to the other two. It was in lowering these cartridges into the well that Bob showed his first signs of caution in handling the explosive liquid, for the least jar or concussion, as the tin tubes were being let down into the well, would have resulted in a premature explosion, which might have had the most deplorable results. Ralph, seeing that at this point even Bob was willing to admit that there might be some danger in the work he was doing, proposed to George that they move a short distance further away, lest there should be an accident, and the reply he received was not well calculated to soothe his nervousness. "If one of those tubes should explode on the surface here, we should stand as good a chance of being killed a quarter of a mile away, as here. So we might just as well stay where we are." And Ralph remained, although he was far from feeling as comfortable as he would have felt at a more respectful distance. "All ready, now," said Bob, as the last cartridge was lowered into position, and the reel removed from the derrick. "Now in order to honor Harnett's guest, I am going to allow him the distinction of exploding the charge." For a moment Ralph thought of what an experience it would be, to explode sixty-four quarts of nitro-glycerine, and what an adventure would be his to relate when he returned to college; therefore he marched boldly up to the well, at the bottom of which was such a dangerous agent ready to do its work. But when he saw the others seeking places of safety from the gases, and possibly fragments that would follow the explosion, and when he stood upon the platform of the derrick which afforded so insecure a foot-hold, because of the oil upon it, his courage failed him. "It may be a big thing," he said to Bob, "to drop this piece of iron through the hole, and be the remote cause of such a powerful effect. But if, when I attempt to get out of the way, my foot should slip, I should hardly be in a condition to care for glory. I am greatly obliged to you for the proposed honor; but think I had better decline it."