The appearance of the second edition of Romberg's "Diseases of the Heart and Blood-Vessels" will be welcomed by every one who is familiar with the previous edition or who desires a clear and concise work on this subject.
In the introductory chapters the author refers to the recent development of accurate methods for studying the heart by instruments such as the sphygmograph, cardiosphygmograph, electrocardiograph and orthodigraph, and the danger of overestimating the value of these newer methods, and drawing conclusions from observations obtained by a single method of observation. He considers these newer methods as valuable aids rather than means that will dispense with our previous methods of examination. The interesting subject of means of determining the functioning power of the heart is reviewed, and the conservative conclusion drawn that all of our present methods for determining the functionating power of the heart are inaccurate and some of them dangerous. He refers