Expositio Canonis Missae: Quarto: 18.5 x12.5 cm Signatures: aa-dd6, 24 of 24 leaves.

Leipzig: Gregorius Böttiger (aka Werman), 1495. Editio princeps. his copy is bound in modern parchment housed in a custom slipcase.. Goff B39; H 2345*; GfT GfT: Gesellschaft für Typenkunde des XV. Jahrhunderts. Veröffentlichungen. 33 parts. Leipzig [etc], 1907-39. 521, 522; Pell 1753; BSB-Ink B-25; GW 3216; ISTC ib00039000. Balthasar de Porta's Canon Missae, also contains the the proposal of the Exposition of the Eucharist before the celebration of mass . This commentary on the Mass, has verses taken from the Jesuida of Hieronymus de Vallibus, which are used in the appropriate context to illustrate or emphasize the author's meaning. We know very few facts about the life of Balthasar de Porta , a Cistercian monk who served as Provisor at the order's College (Saint Bernard) at Leipzig until about 1499. In the same years, he also published another work about Mass, the Expositio mysteriorum missae (Leipzig: Kacheloven, 1494) and a work on the heretical Bohemian Brethren, Conclusiones contra quorundam Bohemorum errores (Lepzig: Böttiger, about 1494), in which Balthasar refutes specific "errors" of the Hussite beliefs. Balthasar de Porta was Provisor of the Cistercian College of St. Bernhard in Leipzig (fl. 1487-1499).