114 



SMITIISOXIAN MISCELLANEOUS COLLECTIONS 



VOL. 54 



Marignac ' obtained the following results. 

 parts of silver is given also: 



Ag. 



8.063 



9.402 



10.339 



12.497 



11.337 



11.307 



4.326 



NH.Cl. 

 3.992 

 4.G5G 

 r>.120 

 G.191 

 5.617 

 5.595 

 2.143 



The ui^ual ratio for 100 



Ratio. 

 49.. 510 

 49.521 

 49.521 

 49.540 

 49.546 

 49.483 

 49.538 



Mean, 49.523; ± .0055 



Corrected to a vacuum this becomes 49. 556, ±.0055. 



Stas ' made three series of determinations of this important ratio, at 

 different times and under varying conditions. All of his weights, as 

 usual, were reduced to a vacuum standard. The third series, published 

 in 1882, was undertaken in order to correct for the solubilit}' of silver 

 chloride, which was not sufficiently guarded against in the earlier work. 

 The values found for the ratio Ag: NH^Cl : : 100: x are as follows: 



.0005 



Mean, 49.-589, it .0018 



The first four determinations in tlie first series are rejected by Stas 

 as unsatisfactory. 



By Scott* two determinations of this ratio are available, with vacuum 

 weights, as follows: 



1 Oeuvres Compl&tes, 1, 89. 



^Oeu^Tes Completes, 1, 378, 478, 781. 



^ Excluding three determinations repeated from the first scries. 



* Journ. Chem. Soc, 79, 147. 1901. 



