"Why do you limit it?" cried Hallowell.
"Because we have had but one manifestation at a time. If this Unknown were out really to frighten—which seems to be his intention—it would be much more effective to visit us with absolute darkness and absolute silence combined. That would be really terrifying. He has not done so. Therefore, I conclude that his power is limited in applicability."
"Isn't that a little doubtful?" spoke up Jack.
"Of course," said Darrow cheerfully. "That's where we're going to win out on this sporting proposition with our dear Brother Eldridge. He won't accept any hypothesis unless it is absolutely copper-riveted. We will."
"I think you underestimate Eldridge," spoke up Hallowell. "He's the only original think-tank in a village of horse troughs."
"I don't underestimate him one bit," countered Darrow; "but we have a head start on him with our reasoning; that's all. He's absolutely sure to come to the conclusions I have just detailed, only he'll get there a little more slowly. That's why I want you in on this thing, Hallowell."
"How's that?"
"We'll publish everything up to date and cut the ground from under him."
"What's your special grouch on Eldridge, anyway?" asked Jack.
"I like to worry him," replied Percy Darrow non-committally.