Mr Macdonald is unknown, but Bolton has suggested that this may have been William Macdonald (b 1732) who was Secretary of the Highland Society in 1784-1804. In 1778 he commissioned Adam to make a design for a bookcase, but the intended location for the bookcase is unknown, and the design is not known to have been executed.

Literature:
A.T. Bolton, The architecture of Robert and James Adam, 1922, Volume II, Index pp. 56, 79; E. Harris, The furniture of Robert Adam, 1963, p. 59

Frances Sands, 2015