Transcriber's Note:
Reading edition
Retained some inconsistent hyphenation (e.g. gun-fire vs. gunfire).
Added missing umlauts to "Würtemberg" in multiple places.
Page v, changed "in not" to "is not."
Page vi, changed "L'illustration" to "L'Illustration" and "Le Monde Illustré" to "Le Monde Illustre" for consistency with image captions.
Page viii, changed "Liège" to "Liége" for consistency.
Page 100, removed unnecessary quote before "I—I—."
Page 104, changed "Evidenly" to "Evidently."
Page 122, changed "in second" to "in seconds."
Page 156, changed "near-by" to "near by" for consistency.
Page 172, removed "he" from "he declared the hunchback."
Page 178, changed "French speak" to "French speaks."
Page 228, added missing close quote after "Yes, sir."
Page 241, changed "is orders" to "'is orders."
Page 252, changed comma to period after "upon the map."
Page 259, removed unnecessary comma from "Two days, later."
Page 308, changed "aeroplane" to "aëroplane" for consistency.
Page 311, changed "aeroplane" to "aëroplane" for consistency.
Page 350, changed "writters" to "writers."
Page 355, changed period to colon after "gasping voice."