“ Firmin Didot (1764–1836) , his brother, second son of François Ambroise, sustained the reputation of the family both as printer and type-founder. He revived (if he did not invent—a distinction which in order of time belongs to William Ged) the process of stereotyping, and coined its name, and he first used the process in his edition of Callet’s Tables of Logarithms (1795) , in which he secured an accuracy till then unattainable. He published stereotyped editions of French, English and Italian classics at a very low price. ”

“ François Ambroise Didot (1730–1804) , son of François, made important improvements in type-founding, and was the first to attempt printing on vellum paper. Among the works which he published was the famous collection of French classics prepared by order of Louis XVI. for the education of the Dauphin, and the folio edition of L’Art de vérifier les dates. Pierre François Didot (1732–1795) , his brother, devoted much attention to the art of type-founding and to paper-making. Among the works which issued from his press was an edition in folio of the Imitatio Christi (1788) . ”

“ In 1875 he published a very learned and elaborate monograph on Aldus Manutius. His collection of MSS., the richest in France, was said to have been worth, at the time of his death, not less than 2,000,000 francs. ”