That the reduced production of some of the chief articles of food in Great Britain and other parts of Europe may have contributed to increase the demand for our breadstuffs and provisions is not doubted, but that the great and efficient cause of this increased demand and of increased prices consists in the removal of artificial restrictions heretofore imposed is deemed to be equally certain. That our exports of food, already increased and increasing beyond former example under the more liberal policy which has been adopted, will be still vastly enlarged unless they be checked or prevented by a restoration of the protective policy can not be doubted. That our commercial and navigating interests will be enlarged in a corresponding ratio with the increase of our trade is equally certain, while our manufacturing interests will still be the favored interests of the country and receive the incidental protection afforded them by revenue duties; and more than this they can not justly demand. In my annual message of December last a tariff of revenue duties based upon the principles of the existing law was recommended, and I have seen no reason to change the opinions then expressed. In view of the probable beneficial effects of that law, I recommend that the policy established by it be maintained. It has but just commenced to operate, and to abandon or modify it without giving it a fair trial would be inexpedient and unwise. Should defects in any of its details be ascertained by actual experience to exist, these may be hereafter corrected; but until such defects shall become manifest the act should be fairly tested. It is submitted for your consideration whether it may not be proper, as a war measure, to impose revenue duties on some of the articles now embraced in the free list. Should it be deemed proper to impose such duties with a view to raise revenue to meet the expenses of the war with Mexico or to avoid to that extent the creation of a public debt, they may be repealed when the emergency which gave rise to them shall cease to exist, and constitute no part of the permanent policy of the country.