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This area covers about twenty-five factories, all engaged in war work of the machine and hardware type. The most frequent injuries are of the so-called hot chip type, which is encountered in grinding. The typical history is the slight sensation of something in the eye, which causes, usually, only momentary discomfort. Often, especially if there is an element of carelessness, the worker does not go to the nurse; or, if he does, she may fail to discern the foreign body. The worker goes home and three to four hours later begins to have pain in the involved eye. By that time the metallic particle has formed