issued no new typical edition of the Roman Missal, but authorized printers to replace the earlier texts for Palm Sunday, Holy Thursday, Good Friday, and the Easter Vigil with those that he began to introduce in 1951 and that he made universally obligatory in 1955. The Pope also removed from the Vigil of Pentecost the series of six Old Testament readings, with their accompanying Tracts and Collects, but these continued to be printed until 1962. Acceding to the wishes of many of the bishops, Pope Pius XII judged it expedient also to reduce the rubrics of the missal to a simpler form, a simplification enacted by a decree of the Sacred Congregation of Rites of 23 March 1955. The changes this made in the General Roman Calendar are indicated in General Roman Calendar of Pope Pius XII. In the following year, 1956, while preparatory studies were being conducted for a general liturgical reform, Pope Pius XII surveyed the opinions of the bishops on the liturgical improvement of the Roman breviary. After duly weighing the answers of the bishops, he judged that it was time to address the need for a general and systematic revision of the rubrics of the breviary and missal. This question he referred to the special committee of experts appointed to study the general liturgical reform. His successor, Pope John XXIII, issued a new typical edition of the Roman Missal in 1962. This incorporated the revised Code of Rubrics which Pope Pius XII's commission had prepared, and which Pope John XXIII had made obligatory with effect from 1 January 1961. In the Missal, this Code of Rubrics replaced two of the documents in the 1920 edition; and the Pope's motu proprio Rubricarum instructum took the place of the superseded Apostolic constitution Divino afflatu of Pope Pius X. Other notable revisions were the omission of the adjective "perfidis" in the Good Friday Prayer for the Jews and the insertion of the name of Saint Joseph into the Canon (or Eucharistic Prayer) of the Mass. Revision following the Second Vatican Council In 1965 and 1967 some changes were officially introduced into the Mass of the Roman Rite in the wake of Sacrosanctum Concilium, but no new edition of the Roman Missal had been produced to incorporate them. They were reflected in the provisional vernacular translations produced in various countries when the language of the people began to be used