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Oppenheim's "Lehrbuch" has so long been accepted as a standard authority that it needs no introduction to neurologists in any country. During the ten years that have elapsed since the sixth edition of this, the first, volume was published, neurology has made such notable advances, many of them the outcome of experience arising in the war, that works of reference that appeared before that time have become largely obsolete. Unfortunately, Hermann Oppenheim, who died May 23, 1919, was not spared to evaluate and incorporate this newly acquired knowledge with that of the past. Faced with the alternative of allowing this magistral work of the genius of Oppenheim to pass into history, the heavy and responsible task of revision was undertaken by his pupil and colleague Cassirer, who was fortunate in enlisting the assistance of Goldstein, Nonne and Pfeifer. These names, in themselves, are sufficient guarantee of a high standard