This work forms part of the second edition of that remarkable "Handbuch der gesamten Augenheilkunde" which, begun in 1898, is not yet finished. The present contribution to that encyclopedic treatise forms only a small part of the author's "History of Ophthalmology from the Earliest Times to the Present Day," and some idea of the enormous amount of labor expended on it by the venerable and erudite writer is gained by referring to the fact that his as yet uncompleted task began with Part 4 in 1899, was continued through many other parts, and already fills 2,793 pages! Fortunately, this protracted and detached method of publication does not materially affect Professor Hirschberg's subject, because the facts of history—unlike for example, the theories of bacteriology and pathology—do not grow stale in fifteen or twenty years.
The present portion of the history hardly equals in merit the author's previous contributions. This failure is