In the six years that we have treated cancer of the cervix with radium in the Woman's Hospital, we have based our treatment on the reaction of the neoplasm to the initial, or, as we prefer to call it, the therapeutic, dose as seen from six to eight weeks after the first radium treatment has been given. In a recent paper by one of us,1the technic of administering the radium and the clinical reaction as seen in the cervix for from six to eight weeks following the application is fully described. In brief, the initial dose given is from 2,400 to 3,600 milligram hours. The radium salt is in tubes, and radium needles are used when the paracervical tissues are involved. Until recently, needles were not used unless the case was a definite Class 3 or 4. We have lately employed needles more frequently in the cervicovaginal margins