His "Researches concerning the Book of Sindibad" were translated in the "Proceedings of the Folk-Lore Society". His "Vergil in the Middle Ages" (translated into English by E. F. M. Benecke, 1895) traces the strange vicissitudes by which the great Augustan poet became successively grammatical fetich, Christian prophet and wizard. Together with Alessandro d'Ancona, Comparetti edited a collection of Italian national songs and stories (9 vols, Turin, 1870–1891), many of which had been collected and written down by himself for the first time.