The power to declare war, to raise and support armies, to provide and maintain a navy, and to call forth the militia to execute the laws, suppress insurrections, and repel invasions was conferred upon Congress as means to provide for the common defense and to protect a territory and a population now widespread and vastly multiplied. As incidental to and indispensable for the exercise of this power, it must sometimes be necessary to construct military roads and protect harbors of refuge. To appropriations by Congress for such objects no sound objection can be raised. Happily for our country, its peaceful policy and rapidly increasing population impose upon us no urgent necessity for preparation, and leave but few trackless deserts between assailable points and a patriotic people ever ready and generally able to protect them. These necessary links the enterprise and energy of our people are steadily and boldly struggling to supply. All experience affirms that wherever private enterprise will avail it is most wise for the General Government to leave to that and individual watchfulness the location and execution of all means of communication. The surveys before alluded to were designed to ascertain the most practicable and economical route for a railroad from the river Mississippi to the Pacific Ocean. Parties are now in the field making explorations, where previous examinations had not supplied sufficient data and where there was the best reason to hope the object sought might be found. The means and time being both limited, it is not to be expected that all the accurate knowledge desired will be obtained, but it is hoped that much and important information will be added to the stock previously possessed, and that partial, if not full, reports of the surveys ordered will be received in time for transmission to the two Houses of Congress on or before the first Monday in February next, as required by the act of appropriation. The magnitude of the enterprise contemplated has aroused and will doubtless continue to excite a very general interest throughout the country. In its political, its commercial, and its military bearings it has varied, great, and increasing claims to consideration. The heavy expense, the great delay, and, at times, fatality attending travel by either of the Isthmus routes have demonstrated the advantage which would result from interterritorial communication by such safe and rapid means as a railroad would supply. These difficulties, which have been encountered in a period of peace, would be magnified and still further increased in time of war. But whilst the embarrassments already encountered and others under new contingencies to be anticipated may serve strikingly to exhibit the importance of such a work, neither these nor all considerations combined can have an appreciable value when weighed against the obligation strictly to adhere to the Constitution and faithfully to execute the powers it confers.