ATOMIC WEIGHTS 459 



Mean, 70.979, ± .0188 



Hence Pd = 105.84. 



This series was rejected by the authors, because the salt was found to 

 contain water — in one case 0.23 per cent. This error, however, sliould 

 not invalidate the Pd:KCl ratio. In a second series the palladiocldoride 

 was dried in vacuo at 100°, giving the following data : 



Mean, 71.257, ± .0736 



These experiments seem to be less concordant than the preceding set. 

 It must be noted, hoAvever, that the authors reject the KCl determina- 

 tions and compute directly from the ratio between the salt and the metal. 

 But the ratio here chosen agrees best with the determinations made by 

 other observers, giving for this series the mean value Pd = 106.36, and 

 is, moreover, uniform with the data given by Berzelius and by Bailey 

 and Lamb. 



Joly and Leidie also give two experiments made by reducing the 

 K2PdCl4 in hydrogen, with the subjoined results: 



Mean, 71.055, ± .0823 

 Hence Pd = 105.96. 

 Combining these data with previous series, Ave haA^e — 



Berzelius 71.233, ± .1066 



Bailey and Lamb 70.485, ± .0290 



Joly and Leidie, first 70.979, ± .0188 



Joly and Leidie, second 71.257, ± .0736 



Joly and Leidie, third 71.055, ±: .0823 



General mean 70.865, ± .0150 



In view of the discordance among the determinations hitherto cited 

 and because of the criticisms made by Keller and Smith, Keiser, jointly 



