ostal
and passenger, in the years of industrial activity that shall follow
the war.

In the preparation of this book the author has made use of many
records of personal experiences of those who have dared the air's
high altitudes and the sea's stilly depths. For permission to use
certain of these he wishes to express his thanks to the Century Co.,
for extracts from _My Airships_ by Santos-Dumont; to Doubleday, Page
& Co., for extracts from _Flying for France_, by James R. McConnell;
to Charles Scribner's Sons, for material drawn from _With the French
Flying Corps_, by Carroll Dana Winslow; to _Collier's Weekly_, for
certain extracts from interviews with Wilbur Wright; to _McClure's
Magazine_, for the account of Mr. Ray Stannard Baker's trip in a
Lake submarine; to Hearst's International Library, and to the
_Scientific American_, for the use of several illustrations.

W. J. A.

NEW YORK, 1918.

CONTENTS

Page
PREFACE iii

CHAPTER

I.--Introductory 3

II.--The Earliest Flying Men 14

III.--The Services of Santos-Dumont 39

IV.--The Count von Zeppelin 59

V.--The Development of the Airplane 82

VI.--The Training of the Aviator 103

VII.--Some Methods of the War in the Air 123

VIII.--Incidents of the War in the Air 159

IX.--The United States at War 182

X.--Some Features of Aerial Warfare 207

XI.--Beginnings of Submarine Invention 235

XII.--The Coming of Steam and Electricity 256

XIII.--John P. Holland and Simon Lake 271

XIV.--The Modern Submarine 294

XV.--Aboard a Submarine 318

XVI.--Submarine Warfare 333

XVII.--The Future of the Submarine 362

Index 383

ILLUS