A note written by Lu Gwei-Djen states: ‘Tea Brick. E.F. Yang gave to B.S. Platt in 1934. Yang said it was in his father’s house ever since he was a child - it must have dated ca 1900. Obtained fr. Platt in 1967’. The brick has the character 福 imprinted on it. The brick is held in a wooden box labelled by Joseph Needham: 'Brick Tea'. Includes a torn postal address label for Lu Gwei-Djen with her address at 28 Owlstone Road, Cambridge.