The Erie Railroad is now completed, from the Hudson River to Dunkirk, 470 miles from New York. A train having on board the Directors of the road, went over the whole distance on the 28th and 29th of April. At the commencement of the enterprise, the State loaned to the road its bonds to the amount of three millions of dollars. Subsequently, an act was passed relieving the Company from the lien imposed by these bonds, on condition that a single track was completed, and engines passed over it, from the Hudson to Lake Erie, before the middle of May. On the day, therefore, in which the first train passed over the road, the earnings of the Company were three millions of dollars. The formal celebration of the opening of the Road took place on the 14th of May, and was attended by the President of the United States and a portion of the Cabinet, as will be seen by a somewhat detailed account in another page of our Magazine. In Massachusetts, the Hon. CHARLES SUMNER has at length been elected to the United States Senate, for the full term of six years. He has taken no prominent part in politics, but is widely known as a scholar and philanthropist.--Soon after the decision of an exciting Fugitive Slave case in Boston, a number of citizens who had invited Mr. Webster to address them on the political condition of the country, petitioned the Board of Aldermen for the use of Faneuil Hall on that occasion. A similar petition having been previously denied to the opponents of the Fugitive Slave Law, that of the friends of Mr. Webster was not granted. The Board subsequently reconsidered their action, and passed a vote concurring with the Common Council in raising a joint committee to invite an address from Mr. Webster, and tendering the use of the Hall for the purpose. The invitation was not accepted.--A violent storm commenced on the 15th of April, and raged for more than a week along the whole extent of the Atlantic coast. During the night of the 17th, the light-house on Minot's Ledge, near Cohasset, was swept away; two assistant keepers who were in the structure were lost.--The secret-ballot law has passed both branches of the Legislature. It provides that the ballots of voters shall be inclosed in envelopes previously to being deposited in the ballot boxes.