This little work is intended for the public rather than for physicians. It is a readable and sensible explanation of the principal facts regarding the effect of the mind on the body in the production of morbid feelings and the simulation of actual disease. We say actual disease, although the disease as it is felt by the patient is often sufficiently real to him at least, and it appears that the increase of nervousness in our modern civilization is as marked abroad as it is in this country. The hygienic instructions here given are sensible, and we believe the translation and presentation of the work to the English reading public will do good. The translation is admirable and the publishers have produced the work in a very attractive form.