"Oh, yes, I know Dr. Sykes. Why did you think of going to see him?"

He smiled apologetically and pointed to the paper.

"It sounds so queer ... the disease. They say, up in Birmingham, that it's stopping all diseases in the hospitals ... everywhere. People getting well all of a sudden. Now I don't believe that."

"Have you seen a case yet?"

"Yes. A woman. In the street this afternoon as I was coming from lunch. The police took her. She was mad, I can tell you. There was a big crowd. She screamed. I think she was drunk." He paused, and glanced at me. "What do you think of it?"

I took a deep breath.

"I don't think, I know," I said, in as quiet a manner as possible. He stared a moment, and a nervous smile appeared and swiftly vanished. He seemed uncertain what to do.

"You've found out something?" he asked at length, playing with his teaspoon and keeping his eyes on the table. I regarded him carefully. I was not quite certain if he still thought I was a doctor.

"I'm not a lunatic," I said. "I'm merely stating a rather extraordinary fact. I know all about the germ of the Blue Disease."

He raised his eyes for an instant, and then lowered them. His hand had stopped trifling with the teaspoon.