Special Dispatch to the New-York Times. BALTIMORE, Thursday, May 10. Before the Convention assembled this morning circulars and handbills were liberally circulated through the Hall, setting forth the availability of Gen. HOUSTON for the Presidency, with EDWARD EVERETT for Vice-President. Though the current had, during the night, set strongly against HOUSTON, his supporters had been very busy. It was understood that a damaging break had been made against HOUSTON in the New-York delegation, and that BELL would receive ten to fifteen votes from that state.