[Hartz, Professor (Gus)] Souvenir of Prof. Hartz. Cleveland: W.J. Morgan & Co., ca. 1874. Pictorially lithographed wraps, enclosing a folded strip of 12 vignettes of Hartz?s conjuring feats, explanatory text to each scene printed on the verso. [24mo (3 5/8 x 3?)]. Light soiling to covers. Rare. Cf. Toole Stott 337. Only the second example we have seen. Toole Stott records a souvenir of almost the same description, but with the title ?M. Hartz,? the stage name of Gus?s brother and fellow magician Joseph Michael Hartz. Most likely the 12 vignettes are the same, but the brothers had separate covers printed. Both English by birth, Joe performed in the States as M. Hartz while Gus used Prof. Hartz. After his brother?s return to England, Gus continued performing in the U.S., eventually settling in Cleveland.