MOHS, Friedrich.

Des Herrn Jac. Fried. von der Null Mineralien-Kabinet, nach einem, durchaus auf äussere Kennzeichen gegründeten Systeme geordnet, beschrieben, und durch Hinzuthuung vieler, dem gegenwärtigen Zustande der Mineralogie angemessener, erläuternder Anmerkungen und nöthiger Berichtigungen, als Handbuch der Oryctognosie brauchbar gemacht.

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1 p.l., lxxii, 594 pp.; 1 p.l., 330 pp.; 1 p.l., 730, [4] pp. Three vols. 8vo, cont. marbled paper boards. Vienna: "Auf Kosten des Besitzers," 1805. First edition, second issue (the first issue bears titles dated 1804); privately printed by Null. Mohs (1773-1839), "one of Abraham Werner's outstanding students...made his primary scientific contribution in systematic mineralogy. He also proposed the scale of hardness for minerals, which is named for him and which is still in use."­D.S.B., IX, p. 447. A journey to Great Britain in 1802 allowed Mohs to study the geology and mineralogy of Ireland and Scotland and to make lasting friends amongst Scottish geologists, including George Mitchell and Robert Jameson. On Mitchell's recommendation, Mohs was commissioned by J.F. von der Null, a Viennese banker, to prepare a systematic description of his important mineral collection. It was in this work, along with two other books published in the same year, that Mohs first expressed his doubts about Werner's mineralogical system. Mohs later established a systematic mineralogy on a completely new basis. Fine set and very rare on the market. Sinkankas, Gemology, 4522. Wilson, The History of Mineral Collecting, pp. 103, 107-08, 219 & 186­"[Null] built an exceptionally fine mineral collection, curated for him by Friedrich Mohs. Megerle von Mühfeld described it as 'not only the best private collection in Vienna, but in all of Germany as well, and technically the most instructive.' This collection of 2 to 4-inch specimens was begun in 1797 and achieved major status in just three years. Between 1797 and 1807 Van der Nüll [sic] purchased no less than eleven important mineral collections. The 1804 catalog runs to three volumes describing 3,926 specimens. The collection was purchased in 1827 by the Royal Imperial mineral cabinet in Vienna."

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