MANN, William Benson, lawyer, born in Burlington county, New Jersey, 27 October, 1816. He was educated under his father, Reverend William Mann, who for many years was at the head of a private school in Philadelphia, read law, and in 1838 was admitted to the bar. He early engaged in politics, and in 1851-'6 was assistant district attorney of Philadelphia. He was then nominated for the district attorneyship against Lewis C. Cassidy. The latter was returned, but Mr. Mann contested the election and secured the office, which he retained by successive re-elections until 1868; and he was again elected in 1871 for a further term of three. years. His abilities as a prosecuting officer were of the highest order, and won for him a wide reputation. For many years Mr. Mann was a prominent figure in Pennsylvania politics. As a delegate to the Republican national convention in 1860, he OF-posed Simon Cameron as a presidential candidate, and did much to bring about the nomination of Mr. Lincoln. His services as a public speaker, during the war and since, have been in great demand. In 1861 he organized the 2d regiment of Pennsylvania reserves, which he commanded from April until November of that year. Since 1874 he has been prothonotary of Philadelphia.