The authors have produced an eminently useful and practical book, which can be commended to the practitioner who proposes to use electricity in the treatment of disease or for surgical work. Part I, of over 140 pages, gives a somewhat extended account of the physics of electricity which might possibly with propriety be left in large part to technical text-books. The presence of numerous algebraic formulæ gives an appearance of mathematics which to many may be more alarming than otherwise, though the subject is skilfully and plainly handled. Part II sets forth electro-physiology with many instructive and new illustrations, and electro-diagnosis is considered, somewhat briefly. The chapter on apparatus recalls rather prominently, by its cuts and text, the catalogues of various manufacturers. Part III takes up the applications of electricity and special electro-therapeutics in an optimistic spirit which is captivating, but may lead to some disappointment, it is feared.