In the discussion of this subject, I am presuming that with the present-day knowledge of radiant energy and the physical laws which govern it, whether this energy emanates from the sun or an electrical source, no progressive medical man can longer deny that radiotherapy has come to stay. Even the shrewd merchant in the commercial field has perceived its popularity and has named his goods, "Radium Diamonds," "Violet-Ray Lotions," "X-Ray Corn Solvents," etc.
Radiotherapy is no longer an experiment, and the proved field is becoming more and more widened until all departments of medicine have had to give it consideration.
Surgical diagnosis without the aid of the Roentgen ray is an antiquated art. Medical diagnosis and treatment with some form of this energy has become a matter of daily routine, though perhaps to the dermatologist these agents lend their greatest therapeutic aid.
The forms and sources of radiant energies which