The Directorium Sacerdotum is a sort of ordinal or directory for the Sarum Use, which though a private compilation by the Brigittine Clement Maydeston, acquired a de facto official status. The text here is taken from the quarto edition published by Wynkyn de Worde in 1495 (Duff, n. 294; GW 8460; STC 17724), and is furnished with indices. Vol. 20 in the present series is the first part, this volume is the second part.