252 THE ATOMIC WEIGHTS. 



Hence Pt = 104.314, ± .078. Tf N = 14, and CI = 35.5, 

 then Pt = 194.906. Calculating with Stas' values for N and 

 CI, Seubert gets from the four results combined above, the fol- 

 lowing figures for Pt, respectively : 194.685, 194.039, 195.034, 

 194.665. 



For the chlorine estimations in the ammonium salt the 

 subjoined weighings are given : 



Salt. PL AgCl. 



2.7054 grm. 1. 187 1 grm. 5.2226 grm. 



2.2748 " .9958 " 43758 " 



3.0822 " I. 3561 " 5-9496 " 



Hence 100 parts of AgCl correspond to the follo^^ing 



quantities of salt : 



5 1 . 802 

 51.986 

 51.805 



Mean, 51.864, ± .041 



Hence, calculating directl}^ from the ratio between 6Ag(X 

 and (NHJ.PtClg, Pt = 196.871, ± .363. 



Seubert himself reckons the percentage of chlorine from 

 the weight of silver chloride, and then calculates the ratio 

 between Clg and Pt.* He thus finds, with Stas' value for CI, 

 Pt = 195.330. 



The potassium salt, K^PtClg, was also analyzed by igni- 

 tion in hydrogen, treatment with water, and weighing both 

 the platinum and the potassium chloride. TJiese percent- 

 ages were found : 



Pt. KCl. 



40.119 30.706 



40.120 30.72S 

 40.076 30.698 

 40.070 30.666 

 40.107 30.700 

 40.120 30.627 

 40.114 30.710 

 40.130 30.621 



Mean 40.107, i .005 Mean, 30.682, ± .009 



From the first column Pt ^ 194.370, rb .068 



" second " " = 194.645, ±i .213 



