290 THE ATOMIC WEIGHTS. 



value, but may be considered as being in some measure confirmator5^ 



They are as follows : 



56.40 



55.60 

 55-3^ 

 55.56 

 55.48 



55.50 

 55-86 

 56.06 

 56.22 

 55.80 

 55.78 

 55.60 

 55.70 

 55.94 



Mean, 55.777, ± -0532 



These values undoubtedly depend on Regnault's value for the weight 

 of hydrogen. Correcting b}^ the later value, as found in the chapter of 

 this work relating to the density ratio H : O, the mean becomes Fe = 

 55.608, ± .0532. Here the probable error in the weight of the hydrogen 

 is ignored, as being of no practical significance. 



The four ratios for iron are now as follows : 



(i.) Per cent. Fe in FejOg, 70.0075, zb .0010 



(2.) Ag2 : FeCIj : : loo : 58.866, zb .0530 



(3-) Agg : FeClg : : 100 : 50.2435, ± .0132 



(4.) H : Fe : : I : 55.608, ± .0532 



Reducing these with — 



O = 15-879, =b .0003 

 Ag = 107.108, =fc .0031 

 CI •= 35-179, ±.0048 



we have — 



From (i) Fe ^ 55-596, dz .0023 



From (2) " =55.742, zb .1140 



From (3) " = 55.907, ± .0450 



From (4) " = 55-608, zb .0532 



General mean Fe = 55.597, zb .0023 



If = 16, then Fe = 56.021. Here all the values are absorbed prac- 

 tically by the first, the other three having no real significance. 



