-
- The Spectator, 22 July 1893
- Year: 1893
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- The Spectator, 8 August 1868
- Year: 1868
-
- The Spectator, 13 May 1893
- Year: 1893
-
- The Spectator, 30 September 1893
- Year: 1893
-
-
- Scientific American (Supplement), 2 May 1891
- Year: 1891
-
- The Spectator, 22 August 1868
- Year: 1868
-
-
- The Spectator, 31 December 1892
- Year: 1892
-
-
- The Spectator, 22 July 1893
- Year: 1893
- Publisher: The Spectator
- Language: English
- Place of Publication: London
-
- The Spectator, 8 August 1868
- Year: 1868
- Publisher: The Spectator
- Language: English
- Place of Publication: London
-
- The Spectator, 13 May 1893
- Year: 1893
- Publisher: The Spectator
- Language: English
- Place of Publication: London
-
- The Spectator, 30 September 1893
- Year: 1893
- Publisher: The Spectator
- Language: English
- Place of Publication: London
-
- Scientific American (Supplement), 16 May 1891
- Year: 1891
- Publisher: Scientific American
- Language: English
- Place of Publication: New York
-
- Scientific American (Supplement), 2 May 1891
- Year: 1891
- Publisher: Scientific American
- Language: English
- Place of Publication: New York
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- The Spectator, 22 August 1868
- Year: 1868
- Publisher: The Spectator
- Language: English
- Place of Publication: London
-
- Scientific American (Supplement), 31 December 1881
- Year: 1881
- Publisher: Scientific American
- Language: English
- Place of Publication: New York
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- The Spectator, 31 December 1892
- Year: 1892
- Publisher: The Spectator
- Language: English
- Place of Publication: London
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- Scientific American (Supplement), 13 February 1892
- Year: 1892
- Publisher: Scientific American
- Language: English
- Place of Publication: New York