Col. Benton has published his plan for a railroad to the Pacific. He advocates tba Central route, for which Colonel Fremont an long expressed a preference. He is in favor ot making this highway on a grand scale, re serving a tract a mile wide for all sorts of roads, rail and macadamized, and two mar gins one hundred feet wide for independent and rival telegraphic lines. He is opposed to making this highway by any mixture of pub lic and private means, or by giving lands to companies, but holds that the United States should build the road and the fixtures, and let out the use of it for terms of seven or ten years to the lowest bidder. The present sys tem of railways from the Mississippi to the Atlantic, he regards as an expanded fan. the spokes of which converge to St. Louis, the handle extending thence to San Francisco.