Perhaps the author may permit the introducer a little liberty of comment. His non-English interpellations, especially Latin and French, may be regarded by some as overdone or perhaps pedantic, but are rather piquant, giving zest to the text. _Diagnosis per exclusionem in ordine_ is sonorous and has a scholarly flavor, but does not prevent the reader who lives beyond the faubourgs of Boston from understanding that the author is speaking of an ancient and well-tried method of differential diagnosis. _Passim_ may be more impressive or thought-fixing than its English translation, but this to the reader will simply prove a matter of individual opinion. _Psychopathia martialis_ is not only mouth-filling like _Senegambia_ or _Mesopotamia_, but really has a claim to appreciation through its evident applicability. It is agreeable to note that the book seems nowhere to indicate that _psychopathia sexualis_ and _psychopathia martialis_ are convertible terms. The bibliography of the volume challenges admiration because of its magnitude and thoroughness and is largely to be credited, as the author indicates, to the energy and efficiency of Sergeant Norman Fenton, who did the work in connection with the Neuropsychiatric Training School at Boston, resorting first-hand to the Boston Medical Library and the Library of the New York Academy of Medicine. After Sergeant Fenton joined the American Expeditionary Force, Dr. Southard greatly increased the value of the bibliography by his personal efforts. This bibliography covers not only the 589 case histories of the book, but it goes beyond this, especially in the presentation of references for 1917, 1918, and even 1919. Owing to the time when our country entered the war, American references are, in the main, of later date than the case histories. They will be found none the less of value to the student of neuropsychiatric problems. The references in the bibliography number in all more than two thousand, distributed so far as nationalities are concerned about as given below, although some mistakes may have crept into this enumeration for various reasons, like the publication of the same articles in the journals of different countries. The list of references includes French, 895; British (English and Colonial), 396; Italian, 77; Russian, 100; American, 253; Spanish, 5; Dutch, 5; Scandinavian, 5; and Austrian and German, 476. It will be seen, therefore, that the bibliography covers in number nearly four times the collected case studies, most of these records being from reports made during the first three years of the war. The author has wisely made an effort to bring the bibliographic work up to and partially including 1919.