Group of 3 offprints. Includes: ZOLLNER. "Beobachtungen von Protuberanzen der Sonne."

Offprint from:: Berichten der Koniglich Sachsischen Gesellschaft der Wissenschaften zu Leipzig, 1 July, 1869., 1869. 8vo. 6 pp. Folding color engraved plate of solar flares. Self-wraps. Rubber stamp of Lick Observatory on cover. Very good. Zollner was the first to use the term 'astrophysics', and importantly designed the reversion spectroscope. He made several important contributions to the study of the sun, and to the science of spectroscopy. WITH: ZOLLNER. "Ueber die Temperatur und Physische Beschaffenheit der Sonne." Offprint from: Berichten der Koniglich Sachsischen Gesellschaft der Wissenschaften zu Leipzig, 2 June, 1870. 8vo. [103]-123 pp. Engraved color plate of solar flares. Original plain wrappers; lacks rear wrapper. Rubber stamp of Lick Observatory & early ms. on cover. WITH: ZOLLNER. "Uber das Rotations-Gesetz der Sonne und der Grossen Planeten." Offprint from: Berichten der Koniglich Sachsischen Gesellschaft der Wissenschaften zu Leipzig, 11 Feb., 1871. 8vo. [49]-113 pp. Engraved color plate of Jupiter. Original plain wrappers; lacks rear wrapper. Rubber stamp of Lick Observatory & early ms. on cover.