Note 9 — TO THE MOST ILLUSTRIOUS AND MOST MIGHTY DUKES OF Saxony, Landgraves of Thuringia, Margraves of Meissen, Imperial Overlords of Saxony, Burgraves of Altenberg and Magdeburg, Counts of Brena, Lords of Pleissnerland, To MAURICE Grand Marshall and Elector of the Holy Roman Empire and to his brother AUGUSTUS,[1] GEORGE AGRICOLA S. D.

[Pg xxvii][9] Jacobi (Der Mineralog Georgius Agricola, Zwickau, 1881, p. 47) says: "Calbus Freibergius, so called by Agricola himself, is certainly no other than the Freiberg Doctor Rühlein von Kalbe; he was, according to Möller, a doctor and burgomaster at Freiberg at the end of the 15th and the beginning of the 16th Centuries.... The chronicler describes him as a fine mathematician, who helped to survey and design the mining towns of Annaberg in 1497 and Marienberg in 1521." We would call attention to the statement of Calbus' views, quoted at the end of Book III, De Re Metallica (p. 75), which are astonishingly similar to statements in the Nützlich Bergbüchlin, and leave little doubt that this "Calbus" was the author of that anonymous book on veins. For further discussion see Appendix B.