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ulcers. 2. Probably X rays prevent the occurrence of superficial secondary deposits. 3. Embryonic cells are more easily destroyed by X rays than are normal cells. Details of 31 Cases of ]ÿIalignant Disease, exaltlding Rodent Ulcer, Treated '!Vtth X Rays at Guy's Hospital dtl1'íng 12 Months, beginning in March, 1907. still attending for treatment when article was written. I Remarks upon the Respective Cases. Case l.-No improvement. Case 2.-Pain diminished. Arm could be moved more freely. Ulcer almost healed up when patient died from pneumonia.Case 3.-Pain relieved, general improvement, and patient said that she felt quite well. Five and a half months after treatment had started a secondary deposit in the sternum two inches in diameter and enlarged glands above both clavicles cleared up. Patient began to go down-hill in December, 1907. Redness and smarting pain from X rays in January, 1908.Case 4.-No improvement. Case 5.-Prophylactic. Case 6.-Recurrence in the scar and secondary deposits in the spine. No improvement.Case 7 :-No improvement. Nodules in the scar and in the skin around it.Case 8.-Discharge and pain diminished. Ulcer decreased in size. Redness and tingling produced, and since then the ulcer has increased in size.Case 9. -Prophylactic. Case 0.—Large fungatmg masses on the buttocks, with profuse offensive discharge. Appetite bad and pain preventing sleep at night. The discharge dimini.hed and lost its offensiveness. Appetite improved and pain diminished, so that the patient was able to sleep at night. Fungations became cleaner. The patient began to lose ground in October, possibly owing to secondary deposits in the liver.Case 11. -Prophylactic.Case JS.—Growth of the breast and subcutaneous nodules. The patient felt better for treatment, and the appetite improved. Pain in breast, neck, and back relieved. Subcutaneous nodules cleared up.Gained three pounds in weight. Gave up attending as she could not afford to live in London.Case .M.—Prophylactic. Case 14.-Prophylactic. Case 15.-The patient was sent for treatment to have the pain of the tumours in his back and axilla relieved. When the pain was easier he went to the seaside and returned for treatment in three weeks. He was vomiting daily and looked very ill. The tumours had increased in size and number. The vomiting stopped after the first treatment, and in a week he was feeling better and had gained three pounds in weight. The appetite was good. It was impossible to treat all the tumours, and those which were not treated grew, and two months later he was as ill as he had been before, though he came up for some time after this in order that he might have his pain relieved by treatment.Case 16.-Treatment had no effect on the right arm, which was swollen and oedematous. The pain in the scar was severe and prevented sleep. The pain was soon relieved and the patient went away for a holiday and he died while he was away.Case 17.-Prophylactic. This case is described in the article. Redness and smarting produced by X rays to ...