These words are in Italian in the original.
Prof. Thausing suggests that this "other Quadro" is the "Christ among the Doctors" in the Barberini Gallery at Rome--a picture containing seven life-size half-figures or heads, and dated 1506. The inscription states it to have been opus quinque dierum. At Brunswick there is an old copy of it. The original studies for the hands are likewise in existence. In Lorenzo Lotto's Madonna of 1508 in the Borghese Gallery at Rome, the head of St. Onuphrius is taken from the model who sat for the front Pharisee on the left in Dürer's picture.
A Nürnberg prison.