General-Register der Bande XXI bis XXXX der Astronomischen Nachrichten.

Hamburg:: Perther- Besser & Mauke, 1856., 1856. 4to. (iv), 313, [1] pp. Indexes. Original printed wrappers; disbound, spine mostly missing. Substantially unopened. Very good (accept for binding). Gustav Adolph Jahn, a private scholar in Leipzig, knew the most outstanding German astronomers of the first half of the 19th century personally or corresponded with them. He saw his main duty in the popularization of astronomical and meteorological knowledge among all classes of people. He chaired the "Astronomische Gesellschaft zu Leipzig" (Leipzig Astronomical Society), edited a journal und supported the cooperation of professionals and amateurs. Many of his ideas were realised in the "Astronomische Gesellschaft" founded in 1863. [Summary of: Munzel, Gisela, "Gustav Adolf Jahn, a Leipzig Astronomer of the 19th Century", Acta Historica Astronomiae, Vol. 10, pp. 100-119].