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 APPENDIX A. AGRICOLA'S WORKS. EORGIUS AGRICOLA was not only the author of works on Mining and allied subjects, usually asso- ciated with his name, but he also interested himself to some extent in political and religious subjects. For convenience in discussion we may, therefore, divide his writings on the broad lines of (i) works on mining, geology, mineralogy, and allied subjects ; (2) works on other subjects, medical, religious, critical, political, and historical. In respect especially to the first division, and partially with regard to the others, we find three principal cases : (a) Works which can be authenticated in European libraries to-day ; (6) references to editions of these in bibliographies, catalogues, etc., which we have been unable to authenticate ; and (c) references to works either un- published or lost. The following are the short titles of all of the published works which we have been able to find on the subjects allied to mining, arranged according to their present importance : De Re Metallica, first edition, 1556 ; De Natura Fossilium, first edition, 1546 ; De Ortu et Causis Subterraneorum, first edition, 1546 ; Bermannus, first edition, 1530 ; Rerum Metatticarum Interpretatio, first edition, 1546 ; De Mensuris et Ponderibus, first edition, 1533 ; De Precio Metallorum et Monetis, first edition, 1550 ; De Veteribus et Novis Metallis, first edition, 1546 ; De Natura eorum quae Effluunt ex Terra, first edition, 1546 ; De Animantibus Subterraneis, first edition, 1549. Of the " lost " or unpublished works, on which there is some evidence, the following are the most important : De Metallicis et Machinis, De Ortu Metallorum Defensio ad Jacobum Scheckium, De Jure et Legibus Metallicis, De Varia Temperie sive Constitutione Aeris, De Terrae Motu, and Commen- tariorum, Libri VI. The known published works upon other subjects are as follows : Latin Grammar, first edition, 1520 ; Two Religious Tracts, first edition, 1522; Galen (Joint Revision of Greek Text), first edition, 1525 ; De Bella adversus Turcam, first edition, 1528 ; De Peste, first edition, 1554. The lost or partially completed works on subjects unrelated to mining, of which some trace has been found, are : De Medicatis Fontibus, De Putre- dine solidas paries, etc., Castigationes in Hippocratem, Typographia Mysnae et Toringiae, De Traditionibus Apostolicis, Oratio de rebus gestis Ernesti et Alberti, Ducum Saxoniae. REVIEW OF PRINCIPAL WORKS. Before proceeding with the bibliographical detail, we consider it desirable to review briefly the most important of the author's works on subjects related to mining.