 The expression "Ad usum Delphini" was sometimes used on other texts which had been expurgated because they contained passages considered inappropriate for the youth, and has been used pejoratively to indicate any work expurgated for the sake of younger audiences, and not just this series of Latin texts and commentaries.The Ad usum Delphini collection was referred to by E.T.A.Hoffmann in "Lebensansichten des Katers Murr" (1819).