'It only remains to add that the plan is recommended by one other consideration, which, in the judgment of the Secretary, is entitled to much influence. It avoids almost, if not altogether, the evils of a great and sudden change in the currency by offering inducements to solvent existing institutions to withdraw the circulation issued under State authority, and substitute that provided by the authority of the Union. Thus, through the voluntary action of the existing institutions, aided by wise legislation, the great transition from a currency heterogeneous, unequal, and unsafe, to one uniform, equal, and safe, may be speedily and almost imperceptibly accomplished. 'If the Secretary has omitted the discussion of the question of the constitutional power of Congress to put this plan into operation, it is because no argument is necessary to establish the proposition that the power to regulate commerce and the value of coin includes the power to regulate the currency of the country, or the collateral proposition that the power to effect the end includes the power to adopt the necessary and expedient means. 'The Secretary entertains the hope that the plan now submitted, if adopted with the limitations and safeguards which the experience and wisdom of senators and representatives will, doubtless, suggest, may impart such value and stability to Government securities that it will not be difficult to obtain the additional loans required for the service of the current and the succeeding year at fair and reasonable rates; especially if the public credit be supported by sufficient and certain provision for the payment of interest and ultimate redemption of the principal.'