From Lincolndom.
Orange C. H., March 8.
--The Washington Chronicle, of the 3d, contains a call for a Republican National Union Convention, to meet in Baltimore June 7th, to nominate candidates for President and Vice-President.
All who favor the suppression of the rebellion and the cause thereof, are invited to send delegates.
The Chronicle says, editorially, it cannot be denied that great bitterness has sprung up in the ranks of the Republican party which threatens to ripen into something worse than the preliminary contest for nomination.
The Chronicle further says that good faith demands that all who send delegates to the Baltimore Convention should stand by the nominee.