130 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 54 



The ratio directly connecting silver nitrate with ammonium chloride 

 has been determined only by Stas.' The usual method of Avorking was 

 followed, namely, nearly equivalent quantities of the two salts were 

 weighed out, the solutions mixed, and the slight excess of one estimated 

 by titration. In four experiments 100 parts of silver nitrate were found 

 equivalent to chloride of ammonium, as follows: 



31.489 

 31.490 

 31.487 

 31.486 



Mean, 31.488, ± .0006 



The similar ratio betAveen potassium chloride and silver nitrate has 

 been determined by both Marignac and Stas. 



Marignac' gives the following weights. I add the quantity of KCl 

 proportional to 100 parts of AgNOg : 



Mean, 43.858, ± .0044 



Corrected to a vacuum this becomes 43.874, ±.0044. 



Stas' ' results are given in three series, representing silver nitrate from 

 three different sources. In the third series the nitrate was weighed in 

 vacuo, while for the other series this correction was applied in the usual 

 way. For the KCl equivalent to 100 parts of AgNOg Stas found: 



First Series. 



43.878 

 43.875 

 43.875 

 43.874 



Mean, 43.8755, ± .0005 



1 Oeuvres Complt'^tcs, 1, 382. 



2 Oeuvres Completes, 1, SS. 



3 Oeuvres Completes, 1, 381. 



