Although there are twenty-eight Meditations given in this book they will not all be needed every year, for the length of Advent varies between twenty-two and twenty-eight days. The Third Sunday of Advent may fall as late as December 17^th (the first day of the "Great O's") and the Fourth Sunday of Advent be Christmas Eve. The plan suggested, which will suit all years, is to use No. 1 on Advent Sunday and the rest according to choice till December 17^th; from then to December 24^th Nos. 21-28 should be used.