“The spectre appeared. But!—it wasn’t from your projector!”

If he expected a cry of surprise, as his grip on Chick’s arm for a warning seemed to indicate, he was, himself, surprised.

“We know it,” Chick, to Don’s amazement remarked.

“You do? Then you saw it?”

“No, Don. Come on. Let’s not talk till we get back to Garry.”

He led the way to the stairs, and instead of going on to the control tower, turned aside at the door to the lower corridor.

“Let’s go into the designing department,” he suggested. “As soon as the control man returns, Garry will meet us there.”

“Just where I meant to go.”

Together they entered the room, lighting its dome bulbs.

“As soon as I saw the picture on the cloud,” Don stated, “I knew it didn’t come from the control room.”