Letter from Mr Cumming to Joseph Black and Doctor Hutton, dated 30 December, no year. The letter is an invitation to supper and an added note says "Mrs Cuming ...will take care to keep a piece of Bun to his (Hutton's) hugminy." The item also includes notes on waters examined for Edinburgh, December 1785, written in Joseph Black's hand. The item was found too late to be put in chronological order.