This is the second edition of this little volume and while there is much of interest in it, it is surprising that a second edition should be needed. The book does not discuss heart disease, nor methods of measuring blood pressure, nor is its scope that of blood pressure in heart disease; but it discusses some of the conditions of high and low blood pressure, and, in most general terms, methods of treatment. The author frequently expresses himself as though high or low arterial tension were a disease instead of a symptom of many different ones. In discussing treatment, however, he does consider the diseases and the treatment of them which may be necessary to remove a disturbance of tension. The book contains nothing which is strikingly original; on the other hand, is not a satisfactory compilation of what is known of the subjects embraced in its title.