Bulletin . till out. After themercury is distilled the bubbler is disconnected, the tube removed from the furnaceand the assay completed in the usual way. It is recommended that the assayer onfirst using this method acquire confidence in his technic by weighing out a drop ofpure mercury as for a standardization of thiocanate, dissolving it in a small amount ofnitric acid, diluting, precipitating with hydrogen sulphide, filtering and assaying filterpaper and percipitate. THE WHITTON METHOD. When the author began the laboratory experiments connected withthe present investigation, it was deemed i
Bulletin . till out. After themercury is distilled the bubbler is disconnected, the tube removed from the furnaceand the assay completed in the usual way. It is recommended that the assayer onfirst using this method acquire confidence in his technic by weighing out a drop ofpure mercury as for a standardization of thiocanate, dissolving it in a small amount ofnitric acid, diluting, precipitating with hydrogen sulphide, filtering and assaying filterpaper and percipitate. THE WHITTON METHOD. When the author began the laboratory experiments connected withthe present investigation, it was deemed important to get early resultsfrom the i)ractieal standpoint relative to concentration. For this rea-son, it was decided to utilize an assay already perfected rather thanto take up any time on research involving a comparison of assaymethods or their improvement; except such as might incidentally ariseduring the progress of the work. After a short study of the methods ( RKSOlRCKS. 281 PLATE PI are or Shield Outer dfffm ner OfOfnilhick Plai
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