From Dr. Voigt's statements that as early as the year 1463, 8,000 men were employed in the alum-works of Tolfa, and that the profit to the apostolic treasury, after the claims of the discoverer and the proprietors had been duly recognized, amounted to 100,000 ducats a year, and from the date of the Pope's Brief quoted above, it would seem that the discovery could scarcely have been made later than 1462, the year assigned to it by Niccolo della Tuccia. The following extract from R. Harrison's translation of A. von Reumont's 'Lorenzo de' Medici,' carries on somewhat further the history of this famous mine and of its position in regard to the Papal Government:-- 'The Pope's affection and confidence were shown in various ways. The Roman depository, i.e., the Receiver's office, was handed over to the Medici, with the permission to choose as their representative Giovanni Tornabuoni, director of the Roman bank. New privileges were also granted to them in connection with their share in the farming of the alum-works of Tolfa. It was an important concession. In the days of Pope Pius II., Giovanni di Castro, son of the famous jurisconsult, Paolo, the principal co-operator in the revision of the Florentine statutes (finished in 1415), discovered alum-deposits in the rock while making geological investigations in the hilly country between Civita Vecchia and the territory of Viterbo, in the vicinity of Tolfa. He instantly perceived the importance of his discovery, which promised to free the West, hitherto poor in this mineral, from a tribute to the distant East, made more inaccessible by the Turkish conquests. In fact the produce soon amounted to 160,000 gold florins; and it is well known what sanguine hopes Pius II., whose eyes were directed towards the East, indulged, that this new source of revenue would aid his enterprises. Genoese houses had employed themselves with the alum-trade till the Medici concluded a contract with the Papal exchequer, which afterwards gave rise to many unpleasant misunderstandings with the financial department.'--(Vol. I. p. 275). An account of the alum of Tolfa is also given in vol. v. chap. i., of the 'Voyages du P. Labat de l'Ordre des FF. Prescheurs, en Espagne et en Italie;' and in the article 'Alaun,' in the 'Oeconomische Encyclopädie,' by Dr. J. G. Krünitz, which is in part derived from Labat's work. GENERAL INDEX TO VOLUMES I.--VIII. _Aarau_, meeting of pastors at, to complain of exile of Megander, vi. 367; deputation sent to Berne, 367 _Abelard_, ii. 18; iii. 44 _Ab Hofen_, Thomas, Bernese deputy to Geneva, ii. 311 _sqq._; his evangelical work, 312; opposition and dejection, 314; death, 316 _Adam_, iii. 301 _sqq._ _Adrian VI._, Pope, attempts to prevent introduction of Luther's works and followers into Spain, viii. 4