Lees and his detectives were fighting with no respect for the rules. Lees managed to get his two hands on the bull-neck of Jouret just as one detective connected a duet of blows to the man's wind. Lees' hands closed in a steely grip, and soon Jouret was limp and helpless. They held him there. An ambulance arrived. A few minutes later a police auto with reserves came on the scene. The police shackled Jouret. The car that had been hit by the phantom was a light sedan. It was occupied by two women. Their bodies were drawn from the wreckage. Both were dead--innocents sacrificed to the blood madness of a maniac. Jouret was right about himself. He was a paranoic with a strongly developed homicidal mania. In the wreckage was found a package containing $200,000 and also two twisted and broken mechanisms. One of these was about the size of an ordinary kitchen coffee-mill, and the other slightly larger. * * * * * Regarding these machines, Lees wrote in a report: "While making a fourth search of Darrow's laboratory, I found the equations, specifications and what I believe to be the full plans for the last invention of the ingenious Darius Darrow. "Many of the most astounding inventions and discoveries have resulted from theories which were laughed to scorn at the time they were advanced. Roebling's plans for the Brooklyn Bridge resulted in a meeting of the foremost engineers of the day. All agreed that the plans were built on a false premise. They argued that the bridge would fall of its own weight. Then they all had a good laugh. The bridge still stands. "Watching smoke float over a hill from army camp fires caused an early French scientist to dream of filling a bag full of smoke and riding with it over the hill. The first balloon was the answer to this dream. "James Watt is said to have gotten his idea for a steam engine from watching a lid on a tea-kettle dance under steam pressure. "When Langley was flying his man-carrying kites the Wright brothers dreamed of hitching an engine and a propeller to a giant kite. The airplane was the result of these experiments. * * * * * "Darrow got his idea from watching a rapidly revolving wheel. He noticed that the spokes and rim blended into a blurred disc when a certain speed was reached. The entire wheel was practically invisible, under certain lighting conditions, when a higher speed was attained. "Darrow went further and reached the conclusion that there was a rate of vibration that would produce invisibility. This was accepted in practically all engineering research plants, long before it was perfected by Darrow. "The facts are that any rapidly vibrating object becomes more and more difficult to outline as its rate of vibration increases. All that was left for Darrow was to arrive at the exact mathematical time, tone, or rate of vibration producing invisibility and to construct a vibrator tuned to produce this condition.