104 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 54 



69.1034 



G9.104 



69.103 



69.102 



09.104 



69.104 



69.105 



69.103 



69.101 



69.105 



69.103 



Mean, 69.1033, ± .0003 



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

 bility of precipitated silver chloride in the menstrua employed in the 

 experiments. Accordingly, in 1883/ 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 ^ 



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 

 69.1211 

 69.1219 

 69.1249 

 69.1238 

 69.1225 

 69.1211 



1 Oeuvres Completes, 1, 762-767, 775-777. 



2 Ann. Chim. Phys. (6), 7, 513. 1886. 



3 OeuvTes Completes, 3, 516, 539. 



