116 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 54 



Scott's single determination of this ratio, 37.3234, falls within the 

 limits of variation of the foregoing series. Including it in the computa- 

 tion, the ratio becomes 



AgCl:NH,Cl: : 100: 37.3218, ± .0003 



All weights were reduced to a vacuum basis. 



For the ratio Ag : NH^Br : : 100 : x there are determinations by Stas 

 and Scott. 



Stas^ obtained the following values for x: 



90.831 



90.831 



90.8297 



90.823 



90.8317 



90.8311 



90.8302 



Scotfs'' data, rejecting 

 ammonium bromide was 



Mean, 90.8297, ± .0008 



three preliminary experiments in which the 

 distinctly acid, are as follows, with vacuum 



weights : 



Mean, 90.7944, ± .0011 



Combining this with the series by Stas, the general mean is 90.8175, 

 ±.00065. 



THE SILVER NITRATE RATIOS. 



The quantity of silver nitrate which can be formed from a known 

 weight of metallic silver has been determined by several investigators. 



1 Oeuvres Completes, 1, 801. 



-Journ. Chem. Soc, 79, 147. 1901. For a criticism by Richards, see Proc. Amer. Phil. Soc, 

 43, 116. 1904. 



