SILVER, POTASSIUM, ETC. 47 



Thorpe and Laurie's on gold. The values so obtained all confirm the 

 results already given, varying within their limits, but having probable 

 errors so high that their use would not affect the final mean. The latter 

 is obtained as follows : 



Marignac 74.077, ± .0030 



Stas 74.081, ±z .0006 



Huntington 74.071, ± .0072 



Richards, 1st series 74.065, ± .0035 



" 2d " 74.067, :t .0034 



General mean 74.080, :4; .00057 



In this case again, as in so many others, Stas' work alone appears at 

 the end, the remaining data having only corroborative value. 



The ratio between silver and potassium bromide was first accurately 

 determined by Marignac.'-i^ I give, with his weighings, the quantity of 

 KBr proportional to 100 parts of Ag : 



Mean, no. 3463, ±: .0020 



Combining this with Marignac's mean result, 110.343, ± .005, we get 

 a general mean of 110.3459, ± .0019. 



*Berzelius' Jahresbericht, 24, 72. 



t Aronstein's translation, pp. 334-347. 



