...drynefis, taken up with HC1 and again evaporated to dryness, then extracted a second time with HGl, evaporated nearly to dryness, taken up with cold water,...charge the approximate quantity of gold, silver, and platinum found in the ore. The check is treated in every way the same as the sample to be examined,...

...is all precipitated. It is well to let the solution stand overnight before filtering off the g/>ld. The gold is filtered off and the platinum, recovered...added to that of the platinum already found. It is ad visable to check results by running a known sample along wit h the unknown. This known sample is...

...and again evaporated to drynese, then extracted a second time with HC1, evaporated nearly to drynees, taken up with cold water, and any residual matter...already found. It is advisable to check results by nmning a known sample along with the unknown. This known sample is made by adding to a crucible charge...