from the stricture that each verse had to be a translation of a scriptural text. Attitudes towards the Biblical text itself had also changed, with closer emphasis being paid on its exact phrasing. This new regard for the letter of the Biblical text diminished the appeal of the psalters' previous versions; those who sang them no longer felt they were singing Scripture. The success of these newer hymns has largely displaced the belief that each hymn must be a direct translation of Scripture. Now, many hymnals contain Biblical references to the passages that inspired the authors, but few are direct translations of Scripture like the metrical psalters were. Metrical psalter in Gaelic The Scottish Gaelic Psalter was produced by the Synod of Argyll. By 1658, the first fifty psalms had been translated into ballad metre due to the work of Dugald Campbell, John Stewart, and Alexander McLaine. A manuscript of the final 100 psalms was produced in 1691 with the entire Gaelic psalter, with revisions to the 'first fifty' being produced in 1694. The Gaelic Metrical Psalms are used to this day in the Scottish Highland Presbyterian Churches where the practice of lining out is used, in accordance with the Westminster Assembly of Divines Directory for Public Worship. The corpus of tunes has shrunk over the years with only about twenty-four in general use. Modern-day metrical psalters Many churches continue to use metrical psalters today. For example, the Reformed Presbyterian Church of North America (RPCNA) produced psalm books based on the Scots Metrical Psalter, with the intention of making the words more modern and the translation more accurate. These were produced in 1889 (a split-leaf brown book), 1911 (unpopular due to musical complexity), 1920 (a green book) and 1929 (also green, an expanded version of the 1920 one), 1950 (a blue book), and 1973 (a maroon one) called The Book of Psalms for Singing. A further revision has been undertaken by the RPCNA, again for the purposes of making the words more modern, and also to replace some of the more difficult-to-sing tunes, such as Psalm 62B, with tunes that are easier to sing. The new edition, The Book of Psalms for Worship, was released in 2009. The Reformed Presbyterian Church of Ireland, however, produced a split-leaf version of the Scots Metrical Psalter, but with additional "Alternative versions" of the words included as the second half of the book. These