This article is from the _Buffalo Express_, October 2, 1869.
It is included in the collection _Mark Twain at the Buffalo
Express_, edited by Joseph B. McCullough and Janice McIntire-
Strasburg, p. 62-64.  The original heading was "The Latest Novelty /
Mental Photographs."  The article was often reprinted over the years
without a citation to the original publication.  For example, the
San Francisco _Call_ reprinted a portion of it as late as July 2, 1905.

Newspapers frequently used Twain material as "filler." Tracing
first appearances becomes a challenge as more and more historic
newspapers become text searchable and when the material had been edited
to make it seem like a new interview or speech.