CHROMIUM. 



245 



tated its solution with mercurous nitrate, and ignited the preci]ntate, 

 with the subjoined results. Vacuum weights are given: 



Mean, 60.332, ± .0037 

 Rawson found, 60.346, zt .0046 



General mean, 60.337, zb .0029 



The chromate of silver, Ag.,CrO^, and the ammonio-chroniate, 

 Ag.^Cr0^.4NH3, both prepared with all necessary precautions to insure 

 purity, were fir.st treated essentially as in Berlin's experiments, except 

 that the traces of silver chloride held in solution by the chromic chloride 

 were thrown out by sulphuretted hydrogen, estimated, and their amount 

 added to the main portion. Thus the chief error in Berlin's work was 

 avoided. I subjoin the data obtained, with vacuum standards, as usual. 

 All of Meineke's results are so corrected : 



.0093 



With the ammonio-cliromate Meineke found as follows 



Ag.firO,.fNH,. AgCl. Cr.fi.,. 



4-1518 2.9724 .7904 



4.2601 

 5-9348 



3-0592 



4.2654 



.8125 

 1.1317 



♦ Calculated back from Meineke's value for Cr, to replace an evident misprint in the original. 



