Wong Bo," Trant said quietly, but with the effect of sending the light swinging half the distance again, "You may know them, but not by name, so I want you to look at these pictures." Trant showed him the first. "Do you know that man, Wong Bo?"
"No," the Chinaman answered patiently. Trant glanced quickly to see that the light stayed steady; then showed him four more pictures of young men, getting the same answer and precisely the same effect. He showed the sixth picture—the photograph of Walter Newberry.
"You know him?" Trant asked precisely in the same tone as the others.
"No," Wong Bo answered with precisely the same patient impassiveness. Not a muscle of his face changed nor an eyelash quivered; but as soon as Trant had displayed this picture and the Chinaman's eyes fell upon it, the light on the screen again jumped a space and settled near the second line to the left!
Trant put aside the portraits and took up the pictures of the houses. He waited again till the light slowly resumed its central position on the screen.
"You have never gone to this house, Wong Bo?" he showed a large, stone mansion, not at all like the Newberry's.
"No," the Chinaman replied, impassive as ever. The light remained steady.
"Nor to this—or this—or this?" Trant showed three more with the same result. "Nor this?" he displayed now a rear view of the Newberry house.
"No," quietly again; but, as when Newberry's name was mentioned and his picture shown, the light
