8vo (222 x 140 mm). Half-title. (Few small spots in margins, small marginal closed tear repaired on title.) Late 19th century red levant gilt, top edge gilt, gilt stamp-signed by Riviere & Son (few small splits along joints). Provenance: Georg Clifford Thomas (bookplate); Wilbur B. Foshay (bookplate); William Howard Bovey (bookplate, embossed stamp on G2).

FIRST EDITION, second issue, with "Miscellaneous" correctly spelled on Contents leaf. Considered one of Shelley's masterpieces, Prometheus Unbound is a continuation of the myth of Prometheus, the Titan who defied the gods by giving first to humanity and suffered eternal punishment as a consequence.