“Yes,” said Vyse obstinately. “But how about using the same g’s?”

Betton laughed again, but Vyse continued without heeding him: “Look here, Betton—could Strett have written them?”

“Strett?” Betton roared. “ Strett?” He threw himself into his arm-chair to shake out his mirth at greater ease.

“I’ll tell you why. Strett always posts all my answers. He comes in for them every day before I leave. He posted the letter to the misunderstood party—the letter from you that the Dead Letter Office didn’t return. I posted my own letter to her; and that came back.”

A measurable silence followed the emission of this ingenious conjecture; then Betton observed with gentle irony: “Extremely neat. And of course it’s no business of yours to supply any valid motive for this remarkable attention on my valet’s part.”

Vyse cast on him a slanting glance.

“If you’ve found that human conduct’s generally based on valid motives—!”

“Well, outside of mad-houses it’s supposed to be not quite incalculable.”

Vyse had an odd smile under his thin moustache. “Every house is a mad-house at some time or another.”

Betton rose with a careless shake of the shoulders. “This one will be if I talk to you much longer,” he said, moving away with a laugh.