In the course of collecting manuscript copies of the Latin grammar of Guarino Veronese (1376-1460) I recently chanced to examine Codex Palatinus Latinus 1760, which according to the inventory in the Vatican Library contains a copy of Guarino's grammar. The inventory is correct: this manuscript does indeed contain the work in question, but as I quickly discovered, it also contains another grammatical work, unnoticed by the compiler of the inventory.
This is a manuscript of eighty-two leaves, of which the text of Guarino's grammar occupies the first thirty-two (fols. 1-32), and the second work the remainder (fols. 33-82), with a blank page (fol. 32v) between the two.