Board of Overseers.

A special meeting of the Board of Overseers was held yesterday morning at 50 State Street. President E. Rockwood Hoar presided, and in the absence of Dr. McKenzie, Dr. Samuel Green acted as secretary pro tempore. The Board confirmed the election of Alexander Agassiz as a member of the Corporation to fill the vacancy made by the death of Professor Gurney. The arrangement of the details of the celebration of the coming two hundred and fiftieth anniversary occupied the remainder of the session, lasting two hours and a half.