To show how chimerical are the hopes of a Currency Restriction Act of Nature, which is to limit and interrupt the blessings with which an increased supply of the precious metals for the general service of the world cannot fail to be attended, it is sufficient to observe that the auriferous region where the gold is found in alluvial deposit, is said to be a tract of country between three and four hundred miles long and from thirty to forty miles broad. It is therefore as long as from London to Berwick, and as broad as the average breadth of the plains of Yorkshire. What is the scraping or excavations of sixty or eighty thousand men on so immense a surface? Conceive every one of these persons _daily digging his own grave_ in this auriferous region: how long will it take them to go over the whole surface and exhaust its treasures? Only apply to it the test of the rudest calculation. A square mile contains above 3,000,000 square yards. Supposing each digging occupies two square yards, there will be 1,500,000 diggings in a square mile; and if each person excavates a digging a-day, which is probably as much as can be calculated upon at an average, as the operation is so much impeded by water, 100,000 persons will take fifteen days to turn up and exhaust one square mile. In the gold region, however, there are at least 9000 square miles. Supposing that the 100,000 persons work 300 days in the year, which is more than can be calculated upon, they will only turn over and thoroughly search twenty square miles in a year. At this rate, it would take above four hundred years for even that large army of labourers to exhaust the _alluvial_ gold region. We are aware the diggings do not go on regularly as is now supposed; that one man tries his fortune here, and another there; and that the earth is perforated at the same time in a great variety of places, many of them at a considerable distance from each other. We know, too, that the real extent of the gold region is hitherto the object of speculation and hope, rather than actual survey or knowledge. It is quite probable, too, that our calculation, which is a mere rough guess, may be above the mark in some particulars, and below it in others. Still, enough, making allowance for all such errors, remains to show that, in the alluvial gold region alone, if the accounts of its extent and riches are at all to be relied on, there is ample room for a vast annual addition to the treasures of the earth for a great many generations to come. The circumstance which makes it all but certain that the gold region must be very extensive, is its being found in the _alluvial_ deposits of the mountain rivers, such as the Sacramento, along their whole course. If you find granite or mica slate particles in the beds of rivers and the level fields they overflow near the sea, you are sure of finding the same deposits up to the mountain regions from which they are brought down.