116 



THE ATOMIC WEIGHTS. 



Second Series. 



Wt. Ag. 

 1.30762 

 2.10322 

 4-57502 

 5.3680 



.S434 

 3-3957 

 3.9607 



4.5750 



Wt. 

 i. 49962 

 2.41225 

 5.24727 

 6.15663 



Third Series. 



2.9172 

 3.8946 

 4.5426 

 5-2473 



Ratio. 



114.683 



114.693 



114.694 



114.691 



Mean, 114.690 



114.697 

 1 14.692 

 114.692 

 114.695 



Mean, 114.694 

 Mean of all as one series, 114.689, db .0012 



For the ratio, measured gravimetrically, 2AgBr : SrBr 2 : : 100 : x, two 



series of determinations are given : 



First Series. 



Wt. AgBr. 



2.4415 

 2.8561 



6.9337 



2.27625 

 3.66140 

 3-88776 

 9.34497 



Wt. SrBr., 

 i. 6086 

 1.8817 

 4.5681 



Second Series. 



1.49962 

 2.41225 



2.56153 

 6.15663 



Ratio. 

 65.886 

 65.884 

 65.883 



Mean, 65.884 



65.881 

 65.883 

 65.887 

 65.882 



Mean, 65.883 

 Mean of all as one series, 65.884, .0006 



For the atomic weight of strontium we now have the subjoined ratios 



(i.) Ag 2 : SrCl 2 : : 100 : 73.47 2 5, . 



(2.) Ag 2 : SrCl 2 .6H 2 O : : 100 : 123.460, dr .0082 



(3.) Per cent. H 2 O in SrCl 2 .6H 2 O, 40.573, =b .0033 



(4.) SrCl 2 : SrSO 4 : : 100 : 115.936, .0040 



(5.) Ag 2 : SrBr 2 : : 100 : 114.689, H= .0012 



(6.) 2 AgBr : SrBr 2 : : 100 : 65.884, .0006 



The antecedent values are 



O. = 15.879, .0003 

 Ag 107.108, .0031 

 Ci = 35.179, .0048 



Br = 79-344, .0062 

 S : 31.828, db .0015 



AgBr 186.452, .0054 



