Roentgen therapy has passed through many changes in its development. Generally speaking, a period of discouragement has followed one of enthusiasm, but enough truth and real value has always remained, and has been demonstrated withal, to produce today the greatest period of enthusiasm that has yet occurred. During this wave of enthusiasm that is passing over the entire country, and that previous to the war had just begun in the countries of Europe, it is well for us to stop and take account of the possibilities and limitations of the Roentgen rays in the treatment of malignant disease. A statistical review would be of little value and would be most difficult to obtain.
It would be of little value, first because since the beginning of the use of the Roentgen rays in the treatment of malignant disease, the technic has passed through a number of stages and it would be