trip from his home to the office of the publishers one
inclement day last spring, to look over the proofs of the
book and, at his suggestion, several important changes were
made. All this was "a labor of love" on Mr. Chanute's
part. He gave of his time and talents freely because he
was enthusiastic in the cause of aviation, and because he
knew the authors of this book and desired to give them
material aid in the preparation of the work--a favor that
was most sincerely appreciated.


The authors desire to make acknowledgment of many courtesies
in the way of valuable advice, information, etc., extended by Mr.
Octave Chanute, C. E., Mr. E. L. Jones, Editor of Aeronautics,
and the publishers of, the New England Automobile Journal and
Fly.



CONTENTS

Chapter

I. Evolution of the Two-Surface Flying Machine
Introductory Chapter by Octave Chanute, C. E.
II. Theory Development and Use
Origin of the Aeroplane--Developments by Chanute
and the Wrights--Practical Uses and Limits.
III. Mechanical Bird Action
What the Motor Does--Puzzle in Bird Soaring.