. Edison, during an active life, has been given to the world. That
life, if there is anything in heredity, is very far from finished; and
while it continues there will be new achievement.

An insistently expressed desire on the part of the public for a
definitive biography of Edison was the reason for the following pages.
The present authors deem themselves happy in the confidence reposed in
them, and in the constant assistance they have enjoyed from Mr. Edison
while preparing these pages, a great many of which are altogether
his own. This co-operation in no sense relieves the authors of
responsibility as to any of the views or statements of their own that
the book contains. They have realized the extreme reluctance of Mr.
Edison to be made the subject of any biography at all; while he has felt
that, if it must be written, it were best done by the hands of friends
and associates of long standing, whose judgment and discretion he could
trust, and whose intimate knowledge of the facts would save him from
misrepresentation.

The authors of the book are profoundly conscious of the fact that the
extraordinary period of electrical development embraced in it has been
prolific of great men. They have named some of them; but there has
been no idea of setting forth various achievements or of ascribing
distinctive merits. This treatment is devoted to one man whom his
fellow-citizens have chosen to regard as in many ways representative of
the American at his finest flowering in the field of invention during
the nineteenth century.

It is designed in these pages to bring the reader face to face with
Edison; to glance at an interesting childhood and a youthful period
marked by a capacity for doing things, and by an insatiable thirst for
knowledge; then to accompany him into the great creative stretch of
forty years, during which he has done so much. This book shows him
plunged deeply into work for which he has always had an incredible
capacity, reveals the exercise of his unsurpassed inventive ability, his
keen reasoning powers, his tenacious memory, his fertility of resource;
follows him through a series of innumerable experiments, conducted
methodically, reaching out like rays of search-light into all the
regions of science and nature, and finally exhibits him emerging
triumphantly from countless difficulties bearing with him in new arts
the fruits of victorious struggle.

These volumes aim to be a biography rather than a histo