Leipzig, B. G. Teubner, 1881. 8vo. Bound in recent full black cloth with gilt lettering to spine. In ""Mathematische Annalen"", Volume 18., 1881. Entire volume offered. Library label pasted on to pasted down front free end-paper. Small library stamp to lower part of title title page and verso of title page. Very fine and clean. Pp. 195-236 . [Entire volume: Pp. IV, 608.]
First printing of these two important papers in the history of Conical function. The functions were introduced by Mehler and expanded by Neumann.