DAVID COOPER POWERS, third son of Peter, and grandson of David Powers, was born June 30, 1822. When eight years of age he removed with his father to Cayuga County, N. Y. He received his academical education at Aurora; studied medicine with his brother-in-law, Nathaniel Leavitt, M. D., and graduated at Berkshire Medical College at Pittsfield, Mass., in 1848. He then went to California, and remained until 1850, when he returned, was married to a daughter of Samuel Ledyard, Esq., of Wayne County, and settled in the practice of his profession, at Auburn, N. Y. In 1853 he again went to California and remained two years, when he returned and removed with his family to Coldwater, Michigan, where he now resides, and is in the practice of his profession. At the breaking out of the rebellion he was appointed Surgeon of the 9th Michigan Infantry, and acted in that capacity some three years.