This work, according to its preface, has been enlarged from an " essay to the dimensions of a general treatise, at the requests and suggestions of pupils and professional friends," in order to "lay special stress upon points which will prove comparatively new to most American readers," and because the author " has felt that there exists a need for a treatise, which, without being so exhaustive as to tire and bewilder the beginner and the general medical reader, shall direct attention to some of the salient points of psychiatry, etc., etc." The work appears, moreover, to be the precurser of a "larger one on insanity which the writer has in preparation, and which will appear in a few years." The work is divided into three parts, of which the first has for its subject " the general characters and the classification of insanity; the second, the special forms of insanity, and the