The sulphate of silver is drawn off and poured upon plates of copper, by which means the silver is precipitated, and sulphate of copper, or blue vitriol, is produced, which, not being of use in the mint, is sold to the Real del Monte Company, where it is employed in obtaining silver. The process by which the company obtain their salt has been already stated, while the lime they use is burned upon the mountains. After all these hard and laborious processes, only from five to ten per cent. of silver is obtained, except in cases of bonanzas, which shows that silver mines can be profitably worked only in those countries where labor commands the lowest standard of wages.
THE HEIRS OF REGLA.
The heirs of the Count Peter inherited his accumulated treasures, his purchased estates, his title, and his prospects of future success in mining, which were as brilliant as they had been in his lifetime. They never dreamed of financial embarrassments in the midst of accumulations of wealth which surpassed the wildest of Oriental romances. They forgot that their wealth rested upon the perfect security which they inherited from the wise and virtuous government of Carlos III., of blessed memory; that he it was who had put out the fires of the Inquisition, and so curtailed the power of the priests that they could no longer plunder with impunity, or rob the Terreros of the fruits of their father's enterprise by threatening them with the censure of the Church, which, in the reign of a feeble king, had a significant meaning. The new code of mining laws, the cheapness of quicksilver, and the opening of commerce, had all combined to make their fortune, which they might lose in a moment if the heir to the throne should prove an idiot, as was most likely, and priests should again usurp the control of affairs, and play their old game of plundering the rich while they excited the populace.
Fortunately for the family of Terreros and the many successful mining families of that period, Charles IV. was not quite so much of an idiot as