On page 13 "aeronaut" was replaced with "æronaut".
On page 14, the semicolon after "eye can reach" was replaced with a comma.
On page 14, "posititons" was replaced with "positions"
On page 15, "intensily" was replaced with "intensely".
On page 16 "aeronaut" was replaced with "æronaut".
On page 22, "charletans" was replaced with "charlatans".
On page 25, "strenght" was replaced with "strength".
On page 28, "XI" in the chapter title was replaced with "XV".
On page 31, "XVI.—" was added in the chapter title.
On page 31, "by" was replaced with "fly".