ATOMIC WEIGHTS • 415 



The chloride ratios, as determined by different chemists, combine thus : 



Ag ratio. 



Dumas 58.321, ± .0010 



Baxter and Hines 58.327, ± .0003 



General mean 58.3265, ± .0003 



AgCl ratio. 



Berzelius with Turner 43.924, ± .0150 



Baxter and Hines 43.898, ± .0005 



General mean 43.898, ± .0005 



In this instance the early work does not even effect the fourtli decimal 

 place. 



We have now to consider the following ratios for manganese : 



(1). 2Ag:MnCL: : 100:. 58.3265, ± .0003 

 (2). 2AgCl:MnCL: : 100: 43.898, ± .0005 

 (3). 2Ag:MnBr,: : 100: 99.539, ± .0005 

 (4). 2AgBr:MnBro: : 100: 57.179, ± .0004 

 (5). H„0:MnA: : 100: 1255.82, ± .3400 

 (6). 2C0,:Mn:: 100: 61.3943, ±.0122 

 ( 7 ) . AgMnO, : Ag + MnO : : 100 : 78.835, ± .0174 

 (8). KBr:AgMnOi: : 100: 190.584, ± .0062 

 (9). MnS04:MnO: : 100: 47.004, ± .0006 

 (10). MnSO,:MnS: : 100: 57.633, ± .0004 



The antecedent atomic -weights are — 



Ag = 107.880, ± .00029 S = 32.0667, ± .00075 



CI = 35.4584, ± .0002 K = 39.0999, ± .0002 



Br = 79.9197, ± .0003 C =12.0038, ± .0002 



H = 1.00779, ± .00001 



Hence, 



From ratio 6 Mn = 54.032, ± .0108 



5 54.081, It .0610 



4 54.925, ± .0020 



3 54.926, ±.0014 



1 54.928, ± .0008 



2 54.928, ±.0015 



8 54.953, ±.0074 



10 54.994, ± .0013 



7 55.009, ± .1522 



9 55.014, ± .0014 



General mean, Mn = 54.947, ± .0005 



In this combination the best work is evidently that of Baxter and 

 Hines, as shown by the concordant values derived from ratios 1 to 4. 

 But AVeeren's work also ai)pears to be excellent, and ought not to be 

 ignored. The general mean takes all the trustworthy determinations into 

 account, and seems to be preferable to any selection among them. 



