Mann, William D.D., an American educator of note, was born in Burlington County, N. Y., about the year 1784. When quite young he was placed in a printing- office, where he remained until his fourteenth year. Though unable to attend school a single day, he acquired a thorough education by private study. He was converted in his 23d year. joined the Methodist Episcopal Church, and shortly after became a local preacher. The principal part of his life after this time was devoted to teaching. He was for some years principal of Matthew Holly Academy, in his native state. Subsequently he removed to Philadelphia, where he maintained a high reputation for his success in teaching the classics. The degree of D.D. was conferred upon him by Dickinson College. He died in Philadelphia July 4,1867. — New An. Cyclop. 1867, p. 567.