Leipzig: Gerhard Fleischer dem Jüngern, 1811. Hardcover. Lacks both illustrations. German astronomer Dr. August Heinrich Christian Gelpke (1769 - 1842) is best known for his theory on comets and how they impact the Earth's surface. Bound in modern black leatherette boards with black and gilt title label to front cover. Rubbing to hinges, edges of boards, and corners. Scuff mark to front cover. Minor toning to margins, else clean interior. Bookplate of Harry Rabinowitz to front pastedown. Size: Thin, small quarto. 80 pages. SCI/042915. Very Good.