"You do not admit the conceivability at all?" he queried. "But why not? We admit the existence of electricity, of which we know nothing. Why should there not be some new force, still unknown to us, which..."
"When electricity was discovered," Levin interrupted hurriedly, "it was only the phenomenon that was discovered, and it was unknown from what it proceeded and what were its effects, and ages passed before its applications were conceived. But the spiritualists have begun with tables writing for them, and spirits appearing to them, and have only later started saying that it is an unknown force."