Preserved the unusual, and inconsistent, references to the Plates. Sometimes Arabic numerals are used, but usually Roman numerals. Most have "A" attached to the name (which was changed to "a" to avoid confusion in the Roman numerals), but not VIII, and sometimes not in the references to them. Equations were converted to linear text, adding spacing and parentheses as necessary. Changed "fumarolles" to "fumaroles" on page 3: "fumaroles and salfatares." Changed "Lyall" to "Lyell" in footnote originally on page 9: "Daubeny, Lyell, Phillips and others." Changed "throught" to "through" on page 35: "passing through it." Removed duplicated word "the" on page 40: "the great Calabrian Earthquake." Page 89 refers to the "Fossa del Vetrano;" elsewhere there are references to "Fossa della Vetrana," which may be what was intended. However, I did not change this. Changed "hydrochloride" to "hydrochloric" on page 109: "the hydrochloric acid which it discharged." Changed "disk" to "disc" on page 126: "the disc and index." Changed "azismuths" to "azimuths" on page 143: "the different azimuths." Changed "silicious" to "siliceous" on page 143: "filled with siliceous sand." End of Project Gutenberg's The Eruption of Vesuvius in 1872, by Luigi Palmieri