"5. Bruxelles, Librairie Européenne C.Muquardt, 1877, in-folio, 52 x 35 cm, (4)pp + 12pp + 6 litho plates ; 13-22pp + 3 plates ; 23-46pp + 3 pl ; 1-16 pp + 6 plates, contemporary cloth, some dust but interior fine. The publication contains 4 studies; 1) On the Spirituale Pomerium ; 2) On Gravure Criblée (Sainte Barbe; St. Benoit ... ; 3) La Vierge de 1418 4) On the blockbook; ''La Légende de Saint Servais''. In this series another two studies, not present here, were published. Studies of rare imprints in the Royal Library in Brussels predating the invention of printing by Gutenberg.."