In this edition of this excellent monograph, Dr. Rockwell has added a short chapter, recapitulating some points in the etiology and pathology of neurasthenia as developed by recent investigation. The book which everywhere preaches the gospel of temperance, and advocates rest as the panacea, concludes the volume with a quotation from Benedict: "If the Americans would learn from the Germans how to amuse themselves, instead of yawning on holidays, the danger of neurasthenia would be diminished. Whoever has not learned how to play and jest, easily succumbs to mental work."