The artist was Frederick Waddy and the image first appeared in the magazine `Once a Week' for Dec 14, 1872. It was used in the small broadside handbill advertising Twain's Sandwich Island lecture at the Brooklyn Academy of Music on Feb 7, 1873. (see MT Speaking, p. 650). There is a good discussion of this image in Frear, MT & Hawaii, pp. 188-89. Paine included it in his 1912 bio of Twain, misdating it ca. 1866-8 (or late 60s anyway) which has led to it being reproduced several times since with the incorrect date attached. Perhaps the very best use of this image was when some bookseller reduced this image down to about an inch in size and reproduced it about 30 times, creating a heard of Twains leap-frogging across the front cover of one of his many splendid Twain catalogues, but modesty does not permit me to reveal his name. Kevin Mac Donnell Austin TX