The extension of our limits has brought within our jurisdiction many additional and populous tribes of Indians, a large proportion of which are wild, untractable, and difficult to control. Predatory and warlike in their disposition and habits, it is impossible altogether to restrain them from committing aggressions on each other, as well as upon our frontier citizens and those emigrating to our distant States and Territories. Hence expensive military expeditions are frequently necessary to overawe and chastise the more lawless and hostile. The present system of making them valuable presents to influence them to remain at peace has proved ineffectual. It is believed to be the better policy to colonize them in suitable localities where they can receive the rudiments of education and be gradually induced to adopt habits of industry. So far as the experiment has been tried it has worked well in practice, and it will doubtless prove to be less expensive than the present system. The whole number of Indians within our territorial limits is believed to be, from the best data in the Interior Department, about 325,000. The tribes of Cherokees, Choctaws, Chickasaws, and Creeks settled in the Territory set apart for them west of Arkansas are rapidly advancing in education and in all the arts of civilization and self-government and we may indulge the agreeable anticipation that at no very distant day they will be incorporated into the Union as one of the sovereign States. It will be seen from the report of the Postmaster-General that the Post-Office Department still continues to depend on the Treasury, as it has been compelled to do for several years past, for an important portion of the means of sustaining and extending its operations. Their rapid growth and expansion are shown by a decennial statement of the number of post-offices and the length of post-roads, commencing with the year 1827. In that year there were 7,000 post-offices; in 1837, 11,177; in 1847, 15,146, and in 1857 they number 26,586. In this year 1,725 post-offices have been established and 704 discontinued, leaving a net increase of 1,021. The postmasters of 368 offices are appointed by the President. The length of post-roads in 1827 was 105,336 miles; in 1837,141,242 miles; in 1847, 153,818 miles, and in the year 1857 there are 242,601 miles of post-road, including 22,530 miles of railroad on which the mails are transported.