134 THE ATOMIC WEIGHTS. 



Berzelius 70.020, ±.0013 



Erdmann and Maichand 70.0094, zb .0080 



Svanberg and Norlin, Oxyd. 69.9534, zfc .0050 



" Reduc. 70.0354, dz .0055 



Maumene 70.0008, zh .0019 



Rivot 69.33, db .013 



General mean 70.0075, zh .0010 



From this we get Fe = 55.891, ± .012; or, if = 16, 

 this becomes 56.0195. 



Dumas'* results, obtained from the chlorides of iron, are 

 of so little weight that they might safely be omitted from 

 our present discussion. For the sake of completeness, how- 

 ever, we will include them. 



Pure ferrous chloride, ignited in a stream of hydrochloric 

 acid gas, was dissolved in water and titrated with a silver 

 solution in the usual way. One hundred parts of silver are 

 equivalent to the amounts of FeCl^ given in the third 

 column : 



3.677 grm. FeCl^ = 6.238 grm. Ag. 58.945 



3.924 " = 6.675 " 58.787 



Mean, 58.866, d= .053 



Ferric chloride, titrated in the same way, gave these re- 

 sults : 



1. 179 grm. Fe.^Cl5= 2.3475 grm. Ag. 50-224 



1.242 " 2.471 " 50-263 



Mean, 50.2435, zh .0132 



These give us two additional values for Fe, as follows : 



From FeClj Fe = 56.028, zt .119 



" Fe^Clg " = 56.189, ± .062 



Combining these with the value deduced from the com- 

 position of FcjOa, Fe = 55.891, it .012, we get this general 

 mean, Fe = 55.913, ± .012. If = IC), this becomes Fe = 

 56.042. 



*Ann. Chem. I'harm., 1 1 ^. 26. i860. 



