James Monroe (Doc) Day, cattleman and drover, was born in Barry County, Missouri, around 1840, the son of Jesse and Sarah (Logan) Day. He was brought to Texas by his family in 1847 and eventually settled in Mountain City, Hays County. Before the Civil War he engaged in stock raising with his father and brother William H. Day. In 1857, with William and Willis McCutcheon of Bastrop County, he pioneered in blazing a cattle trail to Sedalia, Missouri, and Quincy, Illinois. After the Civil War he owned a ranch in Denton County and drove cattle to Iowa and Kansas. He was a brother-in-law of Jesse L. Driskill and was associated for a time with the Driskill businesses in Austin. Day was ranching in New Mexico when he died at Roswell in 1904.