“…For an overview of the debate in the mid-sixteenth century, see again Some occurrences: 1b/20 conuiene , 1b/23 pensiero , 1b/31 sentiero , 1b/39 niente ; 1a/14 fuoco , 1b/17 and 1c/25 luogo , 1b/41 and 1c/50 gentilhuomo , 1b/53 and 1c/54 buon . As far as the bona type is concerned, which alone represents three of the four occurrences of missing diphthongization, we note that in popular spoken Florentine the reduction of the diphthong is well documented only from the seventeenth century (seeSerianni, La lingua ,83), but in writing may recur through Latin influence since Petrarch.16 . The diphthongization of the open-mid vowels preceded by consonant + /r/ is present in all Florentine texts of the century and disappears in the following century; see Paola Manni, Il Trecento toscano .…”