In the meanwhile Emil Gluck, the malevolent wizard and arch-hater, travelled his whirlwind path of destruction. He left no traces. Scientifically thorough, he always cleaned up after himself. His method was to rent a room or a house, and secretly to install his apparatus—which apparatus, by the way, he so perfected and simplified that it occupied little space. After he had accomplished his purpose he carefully removed the apparatus. He bade fair to live out a long life of horrible crime. The epidemic of shooting of New York City policemen was a remarkable affair. It became one of the horror mysteries of the time. In two short weeks over a hundred policemen were shot in the legs by their own revolvers. Inspector Jones did not solve the mystery, but it was his idea that finally outwitted Gluck. On his recommendation the policemen ceased carrying revolvers, and no more accidental shootings occurred. It was in the early spring of 1940 that Gluck destroyed the Mare Island navy-yard. From a room in Vallejo he sent his electric discharges across the Vallejo Straits to Mare Island. He first played his flashes on the battleship _Maryland_. She lay at the dock of one of the mine-magazines. On her forward deck, on a huge temporary platform of timbers, were disposed over a hundred mines. These mines were for the defence of the Golden Gate. Any one of these mines was capable of destroying a dozen battleships, and there were over a hundred mines. The destruction was terrific, but it was only Gluck’s overture. He played his flashes down the Mare Island shore, blowing up five torpedo boats, the torpedo station, and the great magazine at the eastern end of the island. Returning westward again, and scooping in occasional isolated magazines on the high ground back from the shore, he blew up three cruisers and the battleships _Oregon_, _Delaware_, _New Hampshire_, and _Florida_—the latter had just gone into dry-dock, and the magnificent dry-dock was destroyed along with her.