HARTZ, Joseph Michael (1836–1903).SOUVENIR OF PROF. HARTZ. New York: The Graphic Co., ca. 1874. Purple printed wraps with a portrait of Hartz on the upper, and advertising for his gift show (which “will appeal to the mental and emotional faculties”) on the lower. Interior unfolds into twelve scenes illustrating some of Hartz’s illusions. Folding paper case. RARE variant of Toole Stott 337, with different cover image of Hartz, from the press of a different printer.