Transcriber's Notes:
Obvious printer's errors have been repaired, other inconsistent spellings have been kept, including inconsistent use of hyphen (e.g. "air ship" and "air-ship"), diacritical marks (e.g. "êtat" and "état"), and proper names (e.g. "Dostoievski" and "Dostoiewski").
Some illustrations were relocated to correspond to their references in the text.