"Do you know him? He's a stranger to me."
"It's Mr. Parker," said Betty.
John drew in his breath sharply.
"Are you sure?"
"Positive."
John laughed quietly. He thought for a moment, then beckoned to the hovering waiter.
"What are you going to do?" asked Betty.
"Bring me a small lemon," said John.
"Lemon squash, sir?"
"Not a lemon squash. A plain lemon. The fruit of that name. The common or garden citron, which is sharp to the taste and not pleasant to have handed to one. Also a piece of note paper, a little tissue paper, and an envelope.