Three years has elapsed since the appearance of the first edition, during which period short wave radiation has aroused a keen interest in its therapeutic possibilities. That short wave therapy has actually proved superior to diathermy is now the conviction of many authoritative investigators, arrived at after independent, critical study. It was first demonstrated by Schereschewsky in America in 1926, and his labors aroused the intense interest of workers in Austro-German centers, among whom Schliephake, of the research division of the University of Jena, contributed the greatest support and the most original labors.
In the present volume the author has not only collated the opinions of various laborers in the relatively new domain of hertzian short waves but has largely contributed to it both alone and in collaboration with others. This revision of the first edition represents a commendable example of conservative and well balanced discussions on the technical, experimental