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3054 The following is a brief statement of the history of the various cases of necrosis of the jaw, which have developed among employees of the United States Radium Corporation, at its factories in Orange, New Jersey: Case I. - Miss M. M., employed from Oeto- ber 1, 1917, to January 25, 1922, developed a necrosis of the jaw and later died. Case II - Miss V. R., employed from Septem- ber 23, 1918, to April 13, 1921, developed, following the extraction of a tooth by Dr. W. F. B. of Newark, a rapidly progressing necrosis of the jaw, not improved by curetting eight or nine times. Miss R. finally died as a result of this disease process. Case III - Mrs. K., employed from 1917 to 1920 inclusive, devel@ped, following the extraction of a tooth about December, 1923, progressive necrosis of the jaw, necessitating the removal of much of hor left upper jaw and two blood transfusions. This patient died of chronic sepsis on December 9, 1924. Case IV - Miss M. C. , employed for a period of six and one-half years ending December, 1923, began to fail in health in 1920. Her symptoms were extreme fatigue and weakness with pallor. She continued her work in spite