REFLECTIONS ON EMIGRATION--ADVANTAGES OF AMERICA--LAND AND LABOR.--MINES WROUGHT BY AZTECS--MINING DISTRICTS AND EXTENT IN MEXICO.--ERRORS AS TO EARLY SUPPLY OF METALS FROM AMERICA--TRUE PERIOD OF ABUNDANCE--MINES NOT EXHAUSTED--CONDITION--FAMILIES ENRICHED.--EFFECT OF MINING ON AGRICULTURE.--RELATIVE PRODUCT OF SILVER FOR TEN YEARS--TABLE OF PRODUCT--YIELD OF THE MINES SINCE THE CONQUEST.--COINAGE 1844--TOTAL COINAGE 1535 to 1850. MEXICAN MINES, MINERAL WEALTH AND COINAGE. It is generally supposed that the mineral wealth of America was one of the most powerful stimulants of the Spanish conquest and subsequent emigration; nor is the idea erroneous if we recollect the manner in which the Castilian power was founded on this continent and the colonial policy it originated. It will be seen by the tables annexed to this section, that the results have largely fulfilled the hopes of the European adventurers, and that the wealth of the world has been immensely augmented and sustained, by the discovery of our Continent. In the order of the earth's gradual development, under the intellectual enterprise or bodily labor of man, we find the most beautiful system of accommodation to the growing wants or capacities of our race. Space is required for the crowded population of the Old World, and a new continent is suddenly opened, into which the cramped and burdened millions may find room for industry and independent existence. The political institutions of Europe decay in consequence of the encroachments of power, the social degradation of large masses by unjust or unwise systems, or the enforced operation of oppressive laws, and a virgin country is forthwith assigned to man in which the principle of self government may be tried without the necessity of casting off by violence the old fetters of feudalism. The increasing industry or invention of the largely augmented populations of the earth, exacts either a larger amount or a new standard of value for the precious metals, and regions are discovered among the frosts and forests of a far off continent, in which the fable of the golden sands of Pactolus is realized. The labor of men and the flight of time strip commercial countries of their trees, yet, in order to support the required supply of fuel, not only for the comfort and preservation but also for the industry of the race, the heart of the earth beneath the soil which is required for cultivation, is found to be veined with inexhaustible supplies of mineral coal. The bounty and the protective forethought of God for his creatures is not only intimated but proved by these benevolent storehouses of treasure, comfort and freedom; and whilst we acknowledge them with proper gratitude, we should not forget that their acquirement and enduring possession are only to be paid for by labor, economy, and social as well as political forbearance.