Invisible before restoration. Page of a register of the Cathedral of Milan. In the lower space the following numbers have been added, among which the operations can be recognized: 1/2 : 3/5 = 5/6, 1/3 x 5/9 = 5/27, 5/27 : 1/3 = 15/27.

1 3
2 5
5
6
3 11
5 10
36
59
25
5 10

Left-hand column.
Detius de Restis is to give [owes], recorded to the credit of the same in this [book] on folio 164 verso, on the 25th day of September — £ CCC.x.vj s. viiij d. vj
80 s.
57 s. 81 s. 7 d. 7
Item, recorded to the credit of Donato de Comite in this [book] on folio 493, on the 26th day of October — £ ...
Item, recorded to the credit of Donato de Comitte in this [book] on folio 493, on the 6th day of November — £ ...
Item, etcetera. Paro, Sugone, on the 17th day of November — 535.7.0

He is to have [credit], recorded to the debit of Johannes de la Cruce(?) in this [book] on folio 354, on the 25th day of September — £ CC s.
Item, recorded to the debit of Maffeo de Casteleto in this [book] on folio 181, on the above-written day, for Antonio de Fontana — £ lxxxvij s. xviij d.
Item, recorded to the debit of Antonio Carucum(?) in this [book] on folio 27, on the 29th day of October — £ C s.
Item, recorded to the debit of Baptista Magiolino(?) in this [book] on folio 367, on the above-written day — £ C.xL.vij s. viij — 535.7.0