Look at "Address at the Dinner Given by the Whitefriars Club in Honor of Mr. Clemens, London, June 20, 1899."  It's on the Twain's World CD, search for "impromptu".

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From:   Irwin Mortman[SMTP:[log in to unmask]]
Sent:   Saturday, November 29, 1997 13:24 PM
To:     [log in to unmask]
Subject:        Impromptu Speech

Need some help. My local library is trying to help but I thought I might
save some time by asking the mavens on this list.

I looking for the essay about making the impromptu speech. If someone can
tell me what book it is in or if it available online I would be grateful.

Thank you.

Irwin Mortman
Voice 513-891-7359
FAX    513-891-8186
Cincinnati, OH