The Queen of Prussia liked to stage operas, when she wasn’t inciting riotous dinner-table debates among her friends, and the only sense in which she was ever a tyrant was in ordering some poor physicist to don a mad-cap and warble a role for which he was untrained and ill-suited. Princess Caroline had been dragooned, from time to time, to sing a Nymph or Angel part. Nothing, except perhaps for fighting side-by-side in a war, forged bonds among disparate persons so well as performing together on stage, and so Caroline had become a great friend of these grownups, her fellow-sufferers on the boards of the Charlottenburg.