A collection of pieces published to mark the sixtieth anniversary of the first meeting between Huysmans and the Abbé Mugnier in the sacristy of Saint-Thomas d'Aquin, on the 28th May 1891. This plaquette is essentially the same printed version issued by the Société J.-K. Huysmans as an hors-série pamphlet in 1952, but with a different printed cover.