Book 3 of this series shows how libretti were created by Ruggero Leoncavallo and by Luigi Illica and Giuseppe Giacosa using various elements of Henry Murger's novel, Sc nes de la Vie de Boh me (abbreviated as Sc nes; see also Book 1 of the series) and Murger and Th odore Barri re's play, La Vie de Boh me (see also Book 2 of the series). It also contains a comparison of the two libretti.