Mannard. Coghlan nodded. He was sure. He'd seen something happen. He'd figured out part of how it happened. Now he could do things the original makers of the gadget couldn't do. It was not an unprecedented event, of course. A spectacle-maker in Holland once put two lenses together and made a telescope which magnified things but showed them unhappily upside down. And half a continent away, in Italy, one Galileo Galilei heard a rumor of the feat and sat up all night thinking it out--and next morning made a telescope so much better than the rumored one that all field-glasses are made after his design to this day. "I'll back the research," said Mannard shrewdly. "If you'll make a contract with me. I'll play fair. That's good stuff!" He looked at his daughter. Her face was blank. Then her eyes brightened. She smiled at her father. He smiled back. She said, "Tommy--if you can do that--oh, don't you see? Come in the other room for a moment. I want to talk to you!" He blinked at her. Then his shoulders straightened. He took a deep breath, muttered four words, and said, "Hah!" He grabbed her arm and led her through the door. Mannard said satisfiedly: "That's sense! Refrigeration that yields energy! Power from the tropics! Running factories from the heat of the Gulf Stream!""But," said Ghalil, "does not that sound as improbable as that a gadget should have a ghost?"

"No," said Mannard firmly. "That's science! I don't understand it, but it's science! And Laurie wants to marry him, besides. And anyhow, I know the boy! He'll manage it!"

The telephone rang. It rang again. They heard Coghlan answer it. He called: "Lieutenant! For you!"

Ghalil answered the telephone. He pointedly did not observe the new, masterful, confident air worn by Coghlan, or the distinctly radiant expression on Laurie's face. He talked, in Turkish. He hung up. 

"I go back to 80 Hosain," he said briefly. "Something has happened. Poor M. Duval grew hysterical. They had to send for a physician. They do not know what occurred--but there are _changes_ in the room."

"I'm coming with you!" said Coghlan instantly. 

Laurie would not be left behind. Mannard expansively came too. The four of them piled again into the police-car and headed back for the squalid quarter of the city in which the room with the gadget's ghost was to be found. Laurie sat next to Coghlan, and the atmosphere about them was markedly rosy. Ghalil watched streets and buildings rush toward them, the ways grow narrower and darker and the houses seemed to loom above the racing 

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