"My dear sir, say no more."

"But really can you spare the time?"

"There is no rest like change of occupation," I said, with profound
conviction.

The affair was over. On my verandah steps he turned. "I am already greatly
indebted to you," he said.

I made an interrogative noise.

"You have completely cured me of that ridiculous habit of humming," he
explained.

I think I said I was glad to be of any service to him, and he turned away.

Immediately the train of thought that our conversation had suggested must
have resumed its sway. His arms began to wave in their former fashion.
The faint echo of "zuzzoo" came back to me on the breeze....

Well, after all, that was not my affair....

He came the next day, and again the next day after that, and delivered
two lectures on physics to our mutual satisfaction. He talked with an
air of being extremely lucid about the "ether" and "tubes of force," and
"gravitational potential," and things like that, and I sat in my other
folding-chair and said, "Yes," "Go on," "I follow you," to keep him
going. It was tremendously difficult stuff, but I do not think he ever
suspected how much I did not understand him. There were moments when I