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- The Spectator, 11 July 1891
- Year: 1891
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- The Spectator, 13 June 1868
- Year: 1868
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- The Spectator, 1 August 1891
- Year: 1891
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- The Spectator, 31 October 1891
- Year: 1891
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- The Spectator, 18 July 1868
- Year: 1868
-
- The Spectator, 11 July 1868
- Year: 1868
-
- The Spectator, 11 July 1891
- Year: 1891
- Publisher: The Spectator
- Language: English
- Place of Publication: London
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- Scientific American (Supplement), 31 January 1891
- Year: 1891
- Publisher: Scientific American
- Language: English
- Place of Publication: New York
-
- The Spectator, 13 June 1868
- Year: 1868
- Publisher: The Spectator
- Language: English
- Place of Publication: London
-
- The Spectator, 1 August 1891
- Year: 1891
- Publisher: The Spectator
- Language: English
- Place of Publication: London
-
- Scientific American (Supplement), 21 February 1891
- Year: 1891
- Publisher: Scientific American
- Language: English
- Place of Publication: New York
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- Scientific American (Supplement), 24 January 1891
- Year: 1891
- Publisher: Scientific American
- Language: English
- Place of Publication: New York
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- Scientific American (Supplement), 7 February 1891
- Year: 1891
- Publisher: Scientific American
- Language: English
- Place of Publication: New York
-
- The Spectator, 31 October 1891
- Year: 1891
- Publisher: The Spectator
- Language: English
- Place of Publication: London
-
- The Spectator, 18 July 1868
- Year: 1868
- Publisher: The Spectator
- Language: English
- Place of Publication: London
-
- The Spectator, 11 July 1868
- Year: 1868
- Publisher: The Spectator
- Language: English
- Place of Publication: London