That night there was a thunderstorm, and when the professors went out to Nahum's the next day they met with a bitter disappointment. The stone, magnetic as it had been, must have had some peculiar electrical property; for it had "drawn the lightning," as Nahum said, with a singular persistence. Six times within an hour the farmer saw the lightning strike the furrow in the front yard, and when the storm was over nothing remained but a ragged pit by the ancient well-sweep, half-choked with a caved-in earth. Digging had borne no fruit, and the scientists verified the fact of the utter vanishment. The failure was total; so that nothing was left to do but go back to the laboratory and test again the disappearing fragment left carefully cased in lead.