§ 1137. In point of fact, congress cannot be said, in any exact sense, to have yet executed the power to establish post-roads, if by that power we are to understand the designation of particular state-roads, on which the mails shall be carried. The general course has been to designate merely the towns, between which the mails shall be carried, without ascertaining the particular roads at all. Thus, the Act of 20th of February, 1792, ch. 7, (which is but a sample of the other acts,) declares, that "the following roads be established, as post-roads, namely, from Wiscasset in the District of Maine to Savannah in Georgia, by the following route, to wit: Portland, Portsmouth, Newburyport, Ipswich, Salem, Boston, Worcester," &c. &c.; without pointing out any road between those places, on which it should be carried. There are different roads from several of these places to the others. Suppose one of these roads should be discontinued, could the mail-carriers insist upon travelling it?
§ 1138. The truth is, that congress have hitherto acted under the power to a very limited extent only; and will forever continue to do so from principles of public policy and economy, except in cases of an extraordinary nature. There can be no motive to use the power, except for the public good; and circumstances may render it indispensable to carry it out in particular cases to its full limits. It has already occurred, and may hereafter occur, that post-roads may be important and necessary for the purpose of the Union, in peace as well as in war, between places, where there is not any good state-road, and where the amount of travel would not justify any state in an expenditure equal to the construction of such a state-
