It is not the author's purpose in the present volume to give any instruction in the practice of photography. There are many works dealing with the practical side of the subject. His object is to tell the romantic story of the discovery of this wonderful art, and the steps by which its range has been extended until it can achieve results which only a few years ago would have been thought impossible. A glance at the list of chapters will show what a wide field photography now covers, and what service it renders to man, both in his everyday life and in his most subtle scientific researches. - Summary by The Author