"When we were at Clerkenwell Court," Saturn said, "the Tsar sent out a message. It seems that when he visited London some years ago, Sir Isaac gave him a tour of the Mint, which made a lively impression on him. Today when he saw the equipment we have made for handling the gold, he remembered this, and took it into his head that he wished to renew his acquaintance with that curious chap who once showed him around the Mint."