7. This may refer either to
Boyd Houghton’s small engraving
Doing Niagara, in
The Graphic 1 (16 July 1870), p. 57, or to
The Grand Duke Alexis of Russia under Niagara Falls, on the front page of
The Graphic 5 (17 February 1872), p. 141.
Ill. 967 and
Ill. 2089 .