[Footnote 3: The author ought here to have said, _a thin layer_, or _stratum_, to express the obvious meaning intended in the text.--E.]
[Footnote 4: The editor was informed, many years ago, by an intelligent native of Rio Janeiro, that the search for gold is confined by law to certain districts, on purpose to secure the royal fifth; and that all over the country round Rio Janeiro, where the search is prohibited, gold, emeralds, and aqua-marines are found in small quantities, on every occasion of digging to any depth into the earth, as for the purpose of a pit-well.--E.]
The examining the bottom of rivers and beds of torrents, and the washing the gold there found, from the sand and dirt with which it is always mixed, are performed by slaves, who are principally negroes, kept in great numbers by the Portuguese for this purpose. The regulation of the duty of these slaves is singular, as they are each of them obliged to furnish their master with the eighth part of an ounce of gold daily.[5] If they are either so fortunate or industrious as to collect a greater quantity, the surplus becomes their own property, and they may dispose of it as they think fit; so that some negroes, who have accidentally fallen upon rich washing-places, are said to have themselves purchased slaves, and to have lived afterwards in great splendour, their original master having no other demand upon them than the daily supply of the before-mentioned eighths; which, as the Portuguese ounce is somewhat lighter than our troy ounce, may amount to about nine shillings sterling.
[Footnote 5: On the data of the text, and allowing sixty-five days in the year for Sundays and high festivals, the yearly profit of one slave to his master would be L. 135 sterling.--E.]
The quantity of gold thus collected in the Brazils and returned annually to Lisbon, may be estimated, in some degree, from the amount of the royal fifth. This has been of late computed, one year with another, at one hundred and fifty _aroues_, of thirty-two Portuguese pounds each, which, valued at L. 4 sterling the troy ounce, make very nearly three hundred thousand pounds sterling; and consequently the capital, of which this is the fifth, is about a million and a half sterling. It is obvious that the annual return of gold to Lisbon cannot be less than this, though it may be difficult to guess how much more it may be. Perhaps we may not be much mistaken in conjecturing that the gold exchanged with the Spaniards at Buenos Ayres for silver, and what is privately brought to Europe without paying the duty, may amount to near half a million more, which will make the entire yearly produce of Brazilian gold nearly two millions sterling; a prodigious sum to be found in a country which only a few years since was not known to furnish a single grain.