It is an infirmity of our nature to mingle our interests and prejudices with the operation of our reasoning powers, and attribute to the objects of our likes and dislikes qualities they do not possess and effects they can not produce. The effects of the present tariff are doubtless overrated, both in its evils and in its advantages. By one class of reasoners the reduced price of cotton and other agricultural products is ascribed wholly to its influence, and by another the reduced price of manufactured articles. The probability is that neither opinion approaches the truth, and that both are induced by that influence of interests and prejudices to which I have referred. The decrease of prices extends throughout the commercial world, embracing not only the raw material and the manufactured article, but provisions and lands. The cause must therefore be deeper and more pervading than the tariff of the United States. It may in a measure be attributable to the increased value of the precious metals, produced by a diminution of the supply and an increase in the demand, while commerce has rapidly extended itself and population has augmented. The supply of gold and silver, the general medium of exchange, has been greatly interrupted by civil convulsions in the countries from which they are principally drawn. A part of the effect, too, is doubtless owing to an increase of operatives and improvements in machinery. But on the whole it is questionable whether the reduction in the price of lands, produce, and manufactures has been greater than the appreciation of the standard of value. While the chief object of duties should be revenue, they may be so adjusted as to encourage manufactures. In this adjustment, however, it is the duty of the Government to be guided by the general good. Objects of national importance alone ought to be protected. Of these the productions of our soil, our mines, and our workshops, essential to national defense, occupy the first rank. Whatever other species of domestic industry, having the importance to which I have referred, may be expected, after temporary protection, to compete with foreign labor on equal terms merit the same attention in a subordinate degree. The present tariff taxes some of the comforts of life unnecessarily high; it undertakes to protect interests too local and minute to justify a general exaction, and it also attempts to force some kinds of manufactures for which the country is not ripe. Much relief will be derived in some of these respects from the measures of your last session.