These news items from July 1887 may be of interest:

From the _Boston Globe_, July 3, 1887, "Twain as Umpire," p. 1. By Henry Guy
Carleton. With illustrations.

From the _Los Angeles Times_, July 16, 1887, "Mark Twain. He Plays as Umpire
at a Game of Base-Ball at Elmira," p. 10.

From the _Los Angeles Times, July 22, 1887, "Mark Twain as an Umpire." [From
_Philadelphia Times_].