Antique large-scale wall chart with an exploded view of the anatomy of the "Paramecium, Stylonychia, Vorticella, Infusoria, Ciliata". Lithograph on two sheets of paper, mounted on canvas. Vibrant colors, some creasing, discoloration, cropped at the top, cracks at the center top and bottom, but overall good condition considering its age and use. Author and illustrator was Prof. Dr. Paul Pfurtscheller. Pfurtscheller (1855 - 1927) produced a series of 39 "Zoologische Wandtafeln" (zoological wall plates) to be used for higher educational purposes. Although he was a modest high school teacher by training he gained recognition by the scientific Community worldwide for this outstanding work. The bloodsucker is "Plate 17" in the series. The Pfurtscheller wall charts were first published in Vienna, Austria, in 1902, by 'A. Pichler's Witwe & Sohn.' Later editions were also published by Dutch company 'Martinus Nijhoff' until 1953. This item was pubished in Vienna, Austria, by 'A. Pichler's Witwe & Sohn' presumably, circa 1908. Beautiful use of colors and it is one of the lvery early ithographed editions, whereas later editions used offset-printing.   Lithography of course is an enormously demanding technique, especially at this large-scale which required up to 20 manual print-cycles for a single piece, since each color had to be applied seperately. These colors of course were not supposed to overlap in the end. This process is what gives lithographs their extraordinary depth and unusual longevity to their colors.