FOREWORD BY DR. KEYES The results achieved by Dr. Barringer in the control of malignant disease of the prostate and bladder by the application of radium (unconfirmed though they be by the lapse of a number of years) are nevertheless striking and offer a prospect of amelioration and a possibility of cure for early and circumscribed neoplasms such as has not before been claimed for any physical agency. In view of the skepticism which will naturally be aroused by these claims, I feel the obligation of intruding my concurrence. The condition of Prostatic Cases 1, 3, 9 and 10 has been observed by me, both before and after treatment by radium. The condition of Prostatic Cases 5, 8 and 12 I have noted only after treatment. These observations, though few, are sufficient to justify Dr. Barringer's claim to have checked the growth of prostatic carcinoma in apparently incipient cases for