SILVER, POTASSIUM, ETC. 



23 



duced to a vacuum. From these experiments, taking both 

 series as one, we get the following quantities of bromine 

 corresponding to 100 parts of silver : 



74-0830 



74.0790 

 74.0795 

 74.0805 

 74.0830 



Mean, 74.081, d= .0006 



Combining this with Marignac's result, 74.077, ± .003, we 

 get as a general mean the value 74.0809, dr .0006.* 



The ratio between silver and potassium bromide was first 

 accurately determined by Marignac.f I give, with his 

 weighings, the quantity of KBr proportional to 100 parts of 

 Ag: 



KBr. 



110.324 

 110.316 

 110.339 

 110.283 

 110.314 

 110.321 

 110.293 



Mean, corrected for weighing in air, 110.343, ±.005 



Stas,| working in essentially the same manner as when 

 he fixed the ratio between potassium chloride and silver, 

 obtained the following results : 



* O. W. Huntington, in his paper upon the atomic weight of cadmium, ( Amer. 

 Acad. Proc, 1881,) gives three analyses and three syntheses of silver bromide. 

 These give a mean value of Ag : Br : : 100 : 74.064. This figure I record here 

 in order that other chemists may not overlook the work of Mr. Huntington, 

 although it came out too late for use in my own calculations. 



f E. Mulder's Overzigt, p. 1 16. Berzelius' Jahresbericht, 24, 72. 



I Aronstein's Translation, pp. 334-347. 



