“It is a great strain upon him under these adverse conditions,” remarked Ogilvy, looking angrily at Challenger.

“I should think so,” said the latter with a complacent smile.

But Linden was not to be beaten.

“The conditions are bad,” said he. “The vibrations are all wrong. But I’ll try inside the cabinet. It concentrates the force.”

“Well, it’s the last chance,” said Mailey. “We may as well try it.”

The arm-chair was lifted inside the cloth tent and the medium followed, drawing the curtain behind him.

“It condenses the ectoplasmic emanations,” Ogilvy explained.

“No doubt,” said Challenger. “At the same time, in the interests of truth, I must point out that the disappearance of the medium is most regrettable.”

“For goodness sake don’t start wrangling again,” cried Mailey with impatience. “Let us get some results, and then it will be time enough to discuss their value.”

Again there was a weary wait. Then came some hollow groanings from inside the cabinet. The Spiritualists sat up expectantly.