from their two publications on the work and training of their
respective corps; to the Aeronautical Society of Great Britain;
to Messrs.  C.  G.  Spencer & Sons, Highbury; The Sopwith Aviation
Company, Ltd.; Messrs.  A.  V.  Roe & Co., Ltd.; The Gnome Engine
Company; The Green Engine Company; Mr.  A.  G.  Gross (Geographia,
Ltd.); and M.  Bleriot; for an exposition of the
internal-combustion engine I have drawn on Mr.  Horne's The Age of
Machinery. 

PART I.  BALLOONS AND AIR-SHIPS 

I.  MAN'S DUEL WITH NATURE
II.  THE FRENCH PAPER-MAKER WHO INVENTED THE BALLOON
III.  THE FIRST MAN TO ASCEND IN A BALLOON
IV.  THE FIRST BALLOON ASCENT IN ENGLAND
V.  THE FATHER OF BRITISH AERONAUTS
VI.  THE PARACHUTE
VII.  SOME BRITISH INVENTORS OF AIR-SHIPS
VIII.  THE FIRST ATTEMPTS TO STEER A BALLOON
IX.  THE STRANGE CAREER OF COUNT ZEPPELIN