English treatise on "Hydrostaticks" ("De corporibus fluidis"), preceded by philosophical and theological commonplaces ("Status naturae", "Resurrectio") and a short treatise on faith and reason.

8vo, c. 19,5 x 15,5 cm: 55-[1-20 bl.]-[24-12 bl.] pp.

Contemp. leather (worn and loose, lower cover and spine gone). Good condition.

Joined, same format: Encke, Dr. J.F. - "Theoretische Astronomie [...]". Ms. copy by Jac. H. Reinhardt, 1850. [2]-41 pp., paper, German (erratically bound as 21-28, 17-20, 13-16, 9-12, 5-8, 1-4, 29-41). Contemp. half cloth. Johann Franz Encke (1791-1865), Director of the Berlin Observatory, predecessor of the famous Wilhelm Julius Foerster (1832-1921). (2 vol.)