An improved apparatus made entirely of glass for the isolation of fluorine is described, with details of design and a procedure for its use.The process is shorter and more convenient than processes previously described. Data are presented to show the accuracy and the effect of possible interfering agents. FLL'ORIXEhas been separated and isolated by evolution of silicon tetrafluoride in the absence of water in a glass system by Armstrong (1) and Kolthoff and Stansby (10). The isolation

A new electrometric end point for the titration of chlorides with silver nitrate is detected by the potential between a silver wire and a copper wire in a solution of copper sulfate containing the unknown chloride. A simple potentiometer and a microammeter are the only electrical equipment necessary.The errors are of the order of 0.2%. Of 44 ions tested for possible interference, 30 introduce no error.

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