Notes:
“Georgium Sidus” was Herschel’s original name (1781) for Uranus.
Links: 1800 (7th) edition:
http://www.archive.org/details/reflectionsfore01sturgoog
http://www.archive.org/details/reflectionsfore00unkngoog
http://www.archive.org/details/reflectionsfore00sturgoog
1808 (“new edition”):
http://www.archive.org/details/reflectionsonwor01sturiala
“Interesting history of the Princess de Ponthieu” ([p. 36])
Original: “A Story of Beyond the Sea” (Estoire d’Outremer), formerly attributed to Marie de France, probably dating to the 13th century.
Modern (French) text: either a nouvelle from 1723 or 1725 or possibly 1723 by Commandeur de Vignacourt, or a roman of about the same period by Madame de Gomez. Both were called La Comtesse de Ponthieu.
The immediate English source has not been identified.
Link:
[http://www.gutenberg.org/files/11417/11417-h/11417-h.htm#XVI]