Water "base ball" was highlighted in a London front-page newspaper advertisement promoting an upcoming swimming competition: "CRYSTAL PALACE.-- Great Swimming Fete and Competition, Monday next, Aug. 24 at four o'clock. Swimming Races 100, 200, 400 yards, and one mile. Aquatic Steeple-chases. Water Base Ball. Pole Walking. Exhibitions of Ornamental Swimming by Professor Beckwith and others."
Sources
Leighton Buzzard Observerer and Linslade Gazette (Bedfordshire), June 28, 1864, p. 3