290 THE ATOMIC WEIGHTS. 



value, but may be considered as being in some measure confirmatory. 



They are as follows : 



56.40 



55.6o 

 55-3* 

 55.5 6 

 55.48 



55-5 

 55.86 

 56.06 

 56.22 

 55-So 

 55-78 

 55.6o 

 55.70 

 55-94 



Mean, 55-777, .0532 



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

 of hydrogen. Correcting by the later value, as found in the chapter of 

 this work relating to the density ratio H : 0, the mean becomes Fe = 

 55.608, zh .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 Fe 2 O 3 , 70.0075, .0010 



(2.) Ag 2 : FeG 2 : : loo : 58.866, .0530 



(3.) Ag 3 : FeC) 3 : : 100 : 50.2435, .0132 



(4.) H:Fe:: I : 55.608,^.0532 



Reducing these with 



O = 15.879, .0003 



Ag = 107.108, .0031 



Cl = 35.179, .0048 



we have 



From (i) Fe = 55.596, .0023 



From (2) " = 55.742, .1140 



From (3) " = 55.907, .0450 



From (4) " = 55.608, =b .0532 



General mean Fe = 55.597, .0023 



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

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



