One piece of biography I have not seen addressed at length pertains
to the actual traveling companion in Hawaii whom Clemens introduced
to others as "Mr. Brown." He was Edward Tasker Howard of Brooklyn,
New York (born abt. 1844 and died in 1918). Unfortunately, no
correspondence between Howard and Clemens has surfaced and if Howard
left memoirs, they have not been published. Clemens did mistakenly
begin one letter to "Friend Howard" in Dec. 1870. See _Mark Twain's
Letters, Vol. 4, 1870-1871_ pp. 278-279.
Barb