_1521, April 18._ _Pope Leo_ sends a brief to Cardinal Wolsey directing him to carry out the orders for the burning of copies of Luther’s writings. The Cardinal had evidently delayed the promulgation of the Bull _Exurge_. The Pope sends Wolsey a copy of Luther’s treatise on the Babylonian captivity, with the remark that not only the book but the author ought to be burned. Thereupon Wolsey, in his capacity as legate, after consideration with the Archbishop of Canterbury, and with the approval of the king, orders the destruction of all copies of Luther’s writings to be found in England.[82] _1520, June 12._ _Pope Leo_ orders a formal burning in Rome of the available copies of Luther’s writings. With these was burned an effigy of Luther himself. =2. The Bull Coenae Domini, 1364–1586.=--The Bull of the Lord’s Supper presents a collection of the various excommunications which had been ordered by successive popes against certain specified classes of persons, and also against certain individuals on the ground of heresy. In its original wording, it dates from Urban V in 1364,[83] but the form in use through the period of the Reformation was given by Julius II in 1511. Less important changes were made by later popes. Julius II specifies as under excommunication a number of heretical sects, including the Wyclifites or Hussites. The schedule reads: _Patarenos, Pauperes de Lugduno, Arnaldistas, Speronistas, Passagenos, Wiclifitas seu Hussitas, Fraticellos de Opinione nuncupatos, et quoscumque alios haereticos ac omnes fautores_.[84] _1517._ _Leo X_ prohibits, under penalty of the _ex latae sententiae_, the further printing of the _editio princeps_ of the first five books of the History of Tacitus, which had been published by Philip Beroaldus in 1516, under a Milan privilege. The conclusions of the Casuists in regard to the effect of the prohibitions in the _Bulla Coenae_ are summarised as follows by Ferraris[85]: In order that the reading of a book shall bring upon the delinquent the threatened excommunication, 1st. The book must be the production of an actual heretic (not merely of one not baptised, or of a Catholic who through heedlessness or ignorance has given utterance to heresy); 2d. It must contain a heresy, or must have to do with religious matters; 3d. The reader must have knowledge that the book is the work of a heretic, and contains heresy or treats of religion; 4th. The reading must have been done without the permission of the Apostolic Chair; 5th. The reading must be sufficient in amount to constitute a mortal sin. This amount has naturally been variously defined, so as to cover the entire work (Sanchez) or a single page, or two lines (Toletus). [86]