I believe your Horace Plum was in Pasadena, Harris, Texas and purchased property there on October 17, 1903. He is mentioned in David Pomeroy's book PASADENA THE EARLY YEARS, PAGE 84. He was named as the widowed father of Mrs. Minnie McBurney. My interest is that he and two other gentlemen bought land in Pasadena in 1904 for a future Methodist church. If you have any other information concerning this gentlemen our historical group in Pasadena would appreciate hearing from you. His first name was George according to this article, but he apparently was called Horace.