Footnote 13
Part I, §11.  See the two inmost circles in fig. 1.  The names given are adopted from a comparison of the figures in the Cambridge University and Trinity MSS., neither of which are quite correct.  The letters of the `ABC' are what we now call the Sunday letters.  The festivals marked are those of St. Paul (Jan. 25), St. Lawrence (Aug. 10), The Nativity of the Blessed Virgin (Sept. 8), St. Luke (Oct. 18), St. Martin of Tours (Nov. 11), and St. Thomas (Dec. 21).