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Radium- Thorium Poisoning. Seven girla employed at one time in painting dials with a luminous material have died with pathologic conditions that require some explanation as to the cause to which and an examination of the exposure they were sybjected to. The pathologic condition has referred to consisted of a necrosis of the jaw which have been obaerved(togenerally follow the removal of a tooth or dental intervention in the form of treatment of some kind. Severe anemia sets in terminating in death. This holds true for six of the cases The seventh osse did not developa of the jaw, but showed the anomic condition It is commonly reported by her associates thatshe had eaten sem food the Sunday before her death which had rendered her ill. Besides the cases which have resulted in death there havebeen several cases of jaw meorosis among the girls that have been success- fully treated. This necrosis of the jaw in these cases are said to differ from phosphorus poison- ing or ordinary necrosis or typical osteomyletis only in the number of areas imvolved in the first place, and the remote location of the areas from one anather genoralized bony involvement. After operative procedure these cases usually take on a very rapid form of necrosis which necessitates operative procedures at weekly perioda in order to out down the sepais. In the later stages of the disease these necrotic areas pre- faction sent a liquidfication which resembles more or less of a gelatinous character rather than a bony disintergration. One dentist speaks of a case which he has succesafully treated as alow grade infection of the mandible. This mecrotic condition differs in his O= pimion from the ordimary necrosia found in the jaw principally in the faot that it presisted over such a long period of time and ahowed a tendency to recur umless free irainage was at all times maintained, Moaning by this that if the wound appeared to clean and was allowed to heal as in the ordinary oase it would close up and then show a recurrence of the condition. In the Ordinary necrosis of the jaw is far more common than generally admitted but its