"Of course," I said. "It's all really that."

"Just diddle, diddle, diddle?"

"Yes—if you like."

"That is substituting diddle for riddle," he said earnestly. He frowned again and passed his hand across his eyes.

"Yes," I said calmly. "It's going a step up."

I suppose about half an hour passed before either of us spoke again after this extraordinary termination to our conversation. In absolute silence we sat facing one another and during that time I saw the blue stain growing clearer and clearer in Jason's eyes. At last he rose.

"It's very odd," he said. "Tell me, were you like this?"

"How do you feel?"

"As if I had been drunk and suddenly had been made sober. I will leave you. I want to think. I will go down to the country."

"And your papers?"