Part 17

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."

Replaced the infinity symbol on page 131 with "for infinity," in the Latin-1 text version.

Changed "azismuths" to "azimuths" on page 143: "the different azimuths."

Changed "silicious" to "siliceous" on page 143: "filled with siliceous sand."