It was like the two halves of a countersign. But there must be another line after 'the bells of Old Bailey'. Perhaps it could be dug out of Mr Charrington's memory, if he were suitably prompted.

'Who taught you that?' he said.

'My grandfather. He used to say it to me when I was a little girl. He was vaporized when I was eight -- at any rate, he disappeared. I wonder what a lemon was,' she added inconsequently. 'I've seen oranges. They're a kind of round yellow fruit with a thick skin.'

'I can remember lemons,' said Winston. 'They were quite common in the fifties. They were so sour that it set your teeth on edge even to smell them.'

'I bet that picture's got bugs behind it,' said Julia. 'I'll take it down and give it a good clean some day.