206 THE ATOMIC WEIGHTS. 



127.100 

 127.064 



Mean, 127.082, ±: .012 



We have now four series of results showing the quantity 

 of SnOj formed from 100 parts of tin. To Berzelius' single 

 value may be assigned the probable error of a single experi- 

 ment in Mulder and Vlaanderen's series : 



Berzelius 127.200, dr .041 — Oxidation. 



Mulder and Vlaanderen 127.517,^.029 — " 



Dumas 127.105, zb .024 — " 



Vlaanderen 127.082, rfc .012 — ^Reduction. 



General mean 127.143, rt .0098 



Dumas, in the paper previously quoted, also gives the 

 results of some experiments with stannic chloride, SnCl 4. 

 This was titrated with a solution containing a known weight 

 of silver. From the weighings given, 100 parts of silver 

 correspond to the quantities of SnCl^ named in the third 

 column : 



1.839 grm. SnCl^ = 3-054 g"''''- -^g- 60.216 



2.665 " 4-427 " 60.199 



Mean, 60.207, i .006 



All these data properly combined give us the following 

 values for the atomic weight of tin : 



From SnO^ Sn ^= 117.624, rb .050 



" SnCl^. •---- " = 117.832, zh -067 



(general mean " = 1 17.698, rb .040 



If = 10, this becomes Sn = 117.968. 



