Obvious typographical errors have been corrected. Printer's inconsistencies in the use of accents, hyphens, and punctuation have been retained. The original spelling has been used except where there was good reason to correct it. Any such changes are noted below. The following misprints and misspellings have been corrected: Page 3, "avions de reglage" changed to "avions de réglage". (their "avions de réglage," or "regulating aeroplanes.") Page 4, "aviatiks" changed to "Aviatiks". (Aviatiks of the enemy) Page 4, "fusilage" changed to "fuselage". (projected over the bow of the fuselage) Page 11, "pilot- spotted" changed to "pilot spotted". (puffs of smoke in the hazy distance the pilot spotted unerringly) Page 33, "practise" changed to "practice". (And practice in this matter) Page 57, "departs" changed to '"départs"'. (distant reports of the "départs") Page 86, "leant themselves" changed to "lent themselves". (and clay lent themselves to effects which) Page 100, "scrupulously cleanly," changed to "scrupulously clean,". (I found them scrupulously clean, very patient) Page 136, "drommelfeuer" changed to "trommelfeuer". (the famous "trommelfeuer" ... "drum-roll fire," as the Germans call it) There is in the book the single use of the word "exterpreting" (page 78) for which no adequate definition has been found. It is not a spelling mistake. From the context it might be an amusing play on the word "interpreting."