Upon the change in the administration of the National Government, Mr. Butler was reinstated in office, and commissioned on April 15, 1841. He continued to hold the position until December 21, 1846, when he was again removed for political reasons. Mr. Butler was a most obliging man, and his removal was received by the public with general regret. During his two terms he filled the office for more than eighteen years, a longer period than has fallen to the lot of any other postmaster of the town. Near the end of his service a material change was made in the rate of postage on letters; and in his History (page 251) he thus comments on it:-- The experiment of a cheap rate was put upon trial. From May 14, 1841, to December 31, 1844, the net revenue averaged one hundred and twenty-four dollars and seventy-one cents per quarter. Under the new law, for the first year and a half, the revenue has been one hundred and four dollars and seventy-seven cents per quarter. Had the former rates remained, the natural increase of business should have raised it to one hundred and fifty dollars per quarter. The department, which for some years before had fallen short of supporting itself, now became a heavy charge upon the treasury. Whether the present rates will eventually raise a sufficient revenue to meet the expenditures, remains to be seen. The greatest difficulty to be overcome is evasion of the post-office laws and fraud upon the department. Like many other persons of that period, Mr. Butler did not appreciate the fact that the best way to prevent evasions of the law is to reduce the rates of postage so low that it will not pay to run the risk of fraud. Captain Welcome Lothrop succeeded Mr. Butler as postmaster, and during his administration the office was kept in Liberty Hall. Captain Lothrop was a native of Easton, Massachusetts, and a land-surveyor of some repute in this neighborhood. Artemas Wood followed him by appointment on February 22, 1849; but he never entered upon the duties of his office. He was succeeded by George H. Brown, who had published The Spirit of the Times--a political newspaper--during the presidential canvass of 1848, and in this way had become somewhat prominent as a local politician. Mr. Brown was appointed on May 4, 1849; and during his term the office was kept in an ell of his dwelling-house, which was situated nearly opposite to the Orthodox meeting-house. He was afterward the postmaster of Ayer. Mr. Brown was followed by Theodore Andruss, a native of Orford, New Hampshire, who was commissioned on April 11, 1853. Mr. Andruss brought the office back to Liberty Hall, and continued to be the incumbent until April 22, 1861, when he was succeeded by George W. Fiske. On February 13, 1867, Henry Woodcock was appointed to the position, and the office was then removed to the Town Hall, where most excellent accommodations were given to the public.