Economy in the public expenditures is at all times a high duty which all public functionaries of the Government owe to the people. This duty becomes the more imperative in a period of war, when large and extraordinary expenditures become unavoidable. During the existence of the war with Mexico all our resources should be husbanded, and no appropriations made except such as are absolutely necessary for its vigorous prosecution and the due administration of the Government. Objects of appropriation which in peace may be deemed useful or proper, but which are not indispensable for the public service, may when the country is engaged in a foreign war be well postponed to a future period. By the observance of this policy at your present session large amounts may be saved to the Treasury and be applied to objects of pressing and urgent necessity, and thus the creation of a corresponding amount of public debt may be avoided. It is not meant to recommend that the ordinary and necessary appropriations for the support of Government should be withheld; but it is well known that at every session of Congress appropriations are proposed for numerous objects which may or may not be made without materially affecting the public interests, and these it is recommended should not be granted. The act passed at your last session "reducing the duties on imports" not having gone into operation until the 1st of the present month, there has not been time for its practical effect upon the revenue and the business of the country to be developed. It is not doubted, however, that the just policy which it adopts will add largely to our foreign trade and promote the general prosperity. Although it can not be certainly foreseen what amount of revenue it will yield, it is estimated that it will exceed that produced by the act of 1842, which it superseded. The leading principles established by it are to levy the taxes with a view to raise revenue and to impose them upon the articles imported according to their actual value.