Belfast Newspaper Editors.—It is a curious fact that all the principal journals of this town have, changed their editors.  Young Mr. GODKIN, of the Whig, is off to America (he was, during the war, one of the "Specials" of the London Daily News in the Crimera), and a Mr. WHITTY has succeeded him.  Poor, gifted, ever-to-be-lamented MOONEY is succeeded in the News-Letter by Mr. RALPH, an English barrister and graduate of Oxford.  The editor of the Banner is gone, and who (if anybody) has taken his post no one can tell.  It is rumoured that a clever Lisburn amateur writer supplies general leaders.  Poor James SIMMS, of the Mercury, is a shattered wreck — His successor is Mr. Durham DUNLOP, of yore the editor of the Dublin Monitor, Peter PURCELL's journal.  Mr. John ANDERSON, of the defunct old Chronicle, is gone to the Dublin Daily Express to give a helping hand to Mr. GODKIN, senior, formerly of the "Tenant-right" Derry Standard, who is chief editor. —Newry Telegraph