Miss Lambert dedicated her book to Princess Mary, Duchess of Gloucester and Edinburgh (1776-1857), the daughter of King George III.
Source: EDWARDS, Joan (1976). 'A survey of English literature of embroidery, 1840-1940', The Bulletin of the Needle and Bobbin Club, Vol. 76, pp. 3-20. Dowload here.
Digital source of illustration (retrieved 20 November 2016).
WV
The photograph (Antoine Claudet, 1856) shows Princess Mary to the right, with Queen Victoria siting to her left, and Princess Alice to the far left. The man standing between the two ladies is the Prince of Wales (the future King Edward VII).