"Come in," she said, liking his tone, which flattered her by assuming her sense of humour.
"As I'm sleeping at the office to-night, I thought I might as well take one or two of my musical instruments after all. So I came back."
"You've been round?" she asked, meaning round to the Orgreaves'.
"Yes."
"What is it, really?"
"Well, it appears to be pericarditis supervening on renal disease. He lost consciousness, you know."
"Yes, I know. But what is pericarditis?"
"Pericarditis is inflammation of the pericardium."
"And what's the pericardium?"
They both smiled faintly.