42 THE ATOMIC WEIGHTS. 



69.099 



69.1034 



69.104 



69.103 



69. 102 



69.104 



69.104 



69.105 



69.103 



69.101 



69.105 



69.103 



Mean, 69.1033, zb .0003 



In these determinations Stas did not take into account the slight solu- 

 Lihty of precipitated silver chloride in the menstrua employed in the 

 experiments. Accordingly, in 1882 "^^ he published a new series, in which 

 by two methods he remeasured the ratio, guarding against the indicated 

 error, and finding the following values : 



69.1198 

 69.11965 

 69.121 

 69.123 



Mean, 69.1209, ± .0003 



Corrected for a minute trace of silica contained in the potassium 

 chloride, this mean becomes 



69.11903, ± .0003. f 



Still later, in order to establish the absolute constancy of the ratio in 

 question, Stas made yet another series of determinations,;}: in which he 

 employed potassium chloride prepared from four different sources. 

 One lot of silver was used throughout. The values obtained were as 



follows : 



69.1227 



69.1236 



69.1234 



69.1244 



69.1235 



69. 1228 



69.1222 * 



69. 121 1 



69.1219 



69.1249 



69.1238 



69.1225 



69. 1 21 1 



♦Menioires Acad. Roy. de Beige, t. 43. 1882. 

 fSee Van der Plaats, Ann. China. Phys. (6), 7, 15. 

 j Oeuvres Posthumes, edited by W. Spring. 



