A cubic inch of gold is worth (at £3 17_s._ 10-1/2_d._, or $18.69 per ounce) two hundred and ten dollars; a cubic foot, three hundred and sixty-two thousand eight hundred and eighty dollars; a cubic yard, nine millions nine hundred and seventeen thousand seven hundred and sixty dollars. The amount of gold in existence, at the commencement of the Christian era, is estimated to be four hundred and twenty-seven millions of dollars; at the period of the discovery of America, it had diminished to fifty-seven millions; after the occurrence of that event, it gradually increased, and in 1600, it attained to one hundred and five millions; in 1700, to three hundred and fifty-one millions; in 1800, to eleven hundred and twenty-five millions; in 1843, to two thousand millions; in 1853 to three thousand millions; and at the present time, the amount of gold in existence is estimated to be forty-eight hundred millions of dollars; which, welded into one mass, could be contained in a cube of twenty-four feet. Of the amount now in existence, three thousand millions is estimated to be in coin and bullion, and the remainder in watches, jewelry, plate, etc., etc. The Russian gold mines were discovered in 1819, and extend over one third of the circumference of the globe, upon the parallel of 55° of north latitude. Their product, since their discovery to the present time, has amounted to eight hundred millions of dollars. The California gold mines were discovered by William Marshall, on the ninth day of February, 1848, at Sutter's Mill, upon the American Fork, a tributary of the Sacramento, and extend from 34° to 49° of north latitude. Their product, since their discovery to the present time, has amounted to one thousand and forty-seven millions of dollars. The Australia gold mines were discovered by Edward Hammond Hargraves, on the twelfth day of February, 1851, in the Bathurst and Wellington districts, and extend from 30° to 38° of south latitude. Their product, since their discovery to the present time, has amounted to nine hundred and eleven millions of dollars. The finest gold is obtained at Ballurat, and the largest nugget yet obtained weighed twenty-two hundred and seventeen ounces, valued at forty-one thousand dollars. In shape it resembled a continent with a peninsula attached by a narrow isthmus. The annual product of gold at the commencement of the Christian era is estimated at eight hundred thousand dollars; at the period of the discovery of America it had diminished to one hundred thousand dollars; after the occurrence of that event it gradually increased, and in 1600 it attained to two millions; and in 1700, to five millions; in 1800, to fifteen millions; in 1843, to thirty-four millions; in 1850, to eighty-eight millions; in 1852, to two hundred and thirty-six millions; but owing to the falling off of the California as well as the Australia mines, the product of the present year will not probably exceed one hundred and ninety millions.