Leipzig: C. Salfeld 1810. iv, 60 pages. 8vo. Thin paper boards, disbound. Lower third of textblock stained. Former library book with remnants of several stickers removed and discreet withdrawn stamp. Previous private owner bookplate on front pastedown (C.H.F. Peters). Text in German. Fair. Boards. 
Poselger was elected a Member of the Academy of Sciences in 1825, and Professor of Mathematics at the University of Berlin. (Wikisource) A relatively scarce title, with only 5 institutional holdings as of this listing in OCLC/Worldcat.