Opening: r3 (ff. 87v-88r)
Voices: [Triplex], Medius, Contratenor, Tenor, Bassus
Compass: 22 notes
Cantus firmus: Nesciens mater: antiphon ad libitum, memorial of the Nativity after Matins and Vespers during octave of Christmas; Magnificat antiphon, Vespers of St Mary the Virgin from the octave of the Epiphany until the Purification.
Text: ‘The virgin mother, untouched by a man, bore the Saviour without birth-pangs; alone the Virgin suckled the very King of angels, filled with heavenly nourishment’.
Edition: Musica Britannica 12, 10–13