Jones showed a sudden interest, “Have they got charged again?”

“Yes, have they been charged before?”

“Twice before, and I meant to speak to you about it, but it slipped my mind.”

“When did it happen?” Dorothy broke in.

“I’ve got full particulars noted down, up-stairs,” said Jones. “But how about the combination?”

“Never mind that,” cried Tom. “Let me see your data.”

Rapidly we ascended, the slower Jones following some way behind. In the laboratory the assistant turned to a littered desk and fumbled among a mass of papers. I could see that Dorothy was burning with impatience which I could not understand. Jones fumbled on, picking up paper after paper, peering at them blindly through his black-rimmed spectacles. Tom seized my arm and walked me down the room impatiently.

“That man will drive me mad some day,” he exclaimed. “He’s the most accurate investigator and observer we ever had, but he keeps his desk in an unspeakable mess. He’s got that data somewhere, and when he finds it, it will be correct, but he’ll take perhaps an hour to find it. There, thank the Lord!” he remarked, as we turned back, “Dorothy’s taking a hand.”

Then came order from chaos, regularity from irregularity. Paper by paper was read, rejected and placed in its appropriate place, while Jones looked on, by no means displeased. Scarcely five minutes had passed, and the desk had assumed an order foreign to its nature. Ten minutes passed, and Dorothy turned. “It isn’t here, Mr. Jones. Now think, where did you put it?”

Jones seized the knotty problem, bent his mind to it, struggled with it, emerged victorious. “I know,” he said. “It’s in the middle of that black, leather note-book in the third right-hand drawer.”