The door was opened by a manservant. Mazeroux sent in his card.
Hippolyte received the two visitors in his study. The table, on which stood a movable telephone, was littered with books, pamphlets, and papers. There were two tall desks, with diagrams and drawings, and some glass cases containing reduced models, in ivory and steel, of apparatus constructed or invented by the engineer.
A large sofa stood against the wall. In one corner was a winding staircase that led to a circular gallery. An electric chandelier hung from the ceiling.
Mazeroux, after stating his quality and introducing his friend Perenna as also sent by the Prefect of Police, at once expounded the object of their visit.
M. Desmalions, he said, was feeling anxious on the score of very serious indications which he had just received and, without waiting for the next day's interview, begged M. Fauville to take all the precautions which his detectives might advise.
Fauville at first displayed a certain ill humour.
"My precautions are taken, gentlemen, and well taken. And, on the other hand, I am afraid that your interference may do harm."
"In what way?"
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