"Set it down here, in this rack," the professor instructed, indicating an easel-like arrangement in one corner. He himself wheeled a strange electrical apparatus into position in front of the glass. Then took up a position behind a large glass screen, and motioned Mark to join him.
"What are you going to do?"
"You shall see!"
The white-haired savant threw a switch. The laboratory's lights went out. He pressed a button on the control board of the apparatus behind which they stood. Leaned forward eagerly, peering through the glass screen at the mirror. Manipulated dials and levers.
An inexplicable excitement gripped Mark. He had a sudden, unshakable conviction that he and the professor were on the verge of incredible discoveries. Discoveries that would lead him to an explanation of the strange coma that held Elaine in its grim sway.
His brown eyes fastened on the mirror. The next instant they went wide with astonishment.
The glass screen behind which he and the professor were standing was clearly reflected.
But it was merely an opaque surface! Neither he nor the scientist could be seen behind it!
As if reading his mind, Professor Duchard gave vent to a little laugh.