See pages [117] and [122] for examples of this.
That is, for noting or writing the plain song of certain parts of the service which were sung at Christmas and during Holy Week. This explanation I owe to my friend Mr J. T. Micklethwaite.
Evidently mis-spelt for psalterio; and again in the next item.
The quaternion was a gathering of four sheets of vellum, each folded once; thus forming sixteen pages.
This book was partly written on sheets of vellum which were in stauro (in stock), and therefore do not come into the accounts.