FOOTNOTES:
[1] Academie des Sciences, Août 3, 1868.
[2] "Conjectures physiques sur les plus extraordinaires effets du Tonnerre." Paris, MDCXCVI.
Transcriber's Note
Obvious typographical errors were corrected.
Duplicate title at the beginning was deleted.
Hyphenation and accent variants were changed to the most frequently used in the original. Those occurring equally were retained (for example: rainwater and rain- water).