ATOMIC WEIGHTS 



79 



between silver and chlorine, and were not complicated by other considera- 

 tions. Arranged in the order of ascending magnitude, and expressed in 

 the form Ag: CI : : 100 : x, these combine as follows : 



Maumene 32.736, ± .0077 



Berzelius 32.757, ± .0190 



Turner 32.832, ± .0038 



Penny 32.836, ± .0012 



Stas 32.8445, ± .0008 



Marignac 32.854, ± .0024 



Richards and Wells, preliminary 32.861, it .00065 



Richards and Wells, final 32.8668, ± .0005 



Dumas 32.8755, ± .0044 



General mean 32.8582, ± .00042 



This general mean falls within, but near the lower limit of Eichards 

 and Wells' preliminary series. 



A second group of determinations of the silver-chlorine ratio may be 

 termed incidental. A chloride is balanced against silver, and the silver 

 chloride produced is also weighed, and this procedure, intended to fix 

 other atomic weights, also gives values for the ratio now under considera- 

 tion. The following determinations, thus obtained, are all useful. I 

 limit myself, however, to work done by individual authorities, and do 

 not attempt to combine observations, say of RCl : Ag by one chemist, 

 and RCl:AgCl by another, into determinations of the ratio Ag:AgCl. 

 The details of the several investigations will be found in subsequent chap- 

 ters of this work, in relation to what I may term the several collateral 

 elements. 



The first series of this incidental kind to be now considered is due to 

 Lenher," and is derived from his data on the atomic weight of selenium. 

 Silver selenite was converted into silver chloride, and the latter was after- 

 wards reduced to metal by heating in hydrogen. The vacuum weights 

 and the derived ratio appear in the next table. 



1 Journ. Amer. Chem. Soc, 20, 555. 189S. 



