Union movement at the North.
Buffalo, N. Y., Dec. 12.
--A meeting of 300 prominent citizens was held last night for the purpose of requesting Mr. Fillmore to proceed to South Carolina as a messenger of peace.
The committee proceeded to the residence of Mr. Fillmore and extended the invitation; but, though expressing the warmest sympathy with the object of the meeting, he said he was forced to decline the mission, as he had been invited to attend a meeting of the prominent conservative men of New York, and should feel bound to a wait its decision.