a (fols. 1-52) 'The Birds' [ED 88]. Part of vocal score used by printers, drafts, and (fol. 48) one leaf of full score, [c 1883-1885?]. On fols. 49-52 is an organ arrangement of the 'Entracte' by W.G. Alcock, [c 1906?];

b (fols. 53-184) 'The Frogs' [ED 112]. Complete vocal score used by printers, drafts, and (fols. 179-184) 6 leaves of full score, [c 1892?].