These preparations for arming the militia having thus far provided for one of the objects contemplated by the power vested in Congress with respect to that great bulwark of the public safety, it is for their consideration whether further provisions are not requisite for the other contemplated objects of organization and discipline. To give to this great mass of physical and moral force the efficiency which it merits, and is capable of receiving, it is indispensable that they should be instructed and practiced in the rules by which they are to be governed. Toward an accomplishment of this important work I recommend for the consideration of Congress the expediency of instituting a system which shall in the first instance call into the field at the public expense and for a given time certain portions of the commissioned and non-commissioned officers. The instruction and discipline thus acquired would gradually diffuse through the entire body of the militia that practical knowledge and promptitude for active service which are the great ends to be pursued. Experience has left no doubt either of the necessity or of the efficacy of competent military skill in those portions of an army in fitting it for the final duties which it may have to perform. The Corps of Engineers, with the Military Academy, are entitled to the early attention of Congress. The buildings at the seat fixed by law for the present Academy are so far in decay as not to afford the necessary accommodation. But a revision of the law is recommended, principally with a view to a more enlarged cultivation and diffusion of the advantages of such institutions, by providing professorships for all the necessary branches of military instruction, and by the establishment of an additional academy at the seat of Government or elsewhere. The means by which war, as well for defense as for offense, are now carried on render these schools of the more scientific operations an indispensable part of every adequate system. Even among nations whose large standing armies and frequent wars afford every other opportunity of instruction these establishments are found to be indispensable for the due attainment of the branches of military science which require a regular course of study and experiment. In a government happily without the other opportunities seminaries where the elementary principles of the art of war can be taught without actual war, and without the expense of extensive and standing armies, have the precious advantage of uniting an essential preparation against external danger with a scrupulous regard to internal safety. In no other way, probably, can a provision of equal efficacy for the public defense be made at so little expense or more consistently with the public liberty.