SODIUM. 26l 



on pp. 169-198, and the last folly on this topic is presented 

 pp. 169-209. 



The determinations of Julius Tfiomsen, of Copenhagen 

 (Oversigt pp. 342-355; 1893), have been used by Clarke 

 (1897, 69), and called u valuable" for nitrogen; hence we 

 must consider them here, though they were made for the 

 ratio O : H. 



H Cl : Ha 1^ 36.5 : 17 = 2.14 706. Chg. 1256 low. 



Series I n Det., 160 030; 130. Mean 613 low. 



" II 5 Det., 130 067; 63. " 614 low. 



" III 2 Det., 094 08 1 ; 13. " 618 low. 



We see here the Stasio-Clarkian demand of concordance 

 to be the sole aim; the range is reduced from 130 to 13. 

 But the constant error remains practically the same, and 

 amounts to about 0.55 on N, making it N= 14.05. 



Of course, if the process is correct, it must apply equally 

 well for O or N (see pp. 144-147). 



But the process is not good (p. 54), and conflicts with 

 the rule and spirit of Berzelius, who seems to be forgotten 

 in Denmark. Compare p. 84. 



Na = 23. SODIUM. Mrs. ASTON, 1893. 



The determination of boron by Ramsay and Aston, in 

 1893, we have utilized for a truly crucial determination of 

 boron, which we have credited to Ramsay, and an excellent 

 determination of Na which is credited to Mrs. Aston. 



The precision is certainly within o.oi. See pp. 147-148. 



The only other process that needs consideration is the 

 following: 



Na2 O4 S : Na2 Os C = 142 : 106 = 1.33 962. Chg. 64 low. 

 Richards, 1891, 8 Det. 005 950; 55. Mean 23 high. 



The range represents 0.086 on the atomic weight, and the 

 analytical excess 23 high represents 0.036 low on the atomic 

 weight, making it 22.964. 



We see that this work of Richards would be strongly 

 confirmatory, if such volumetric work had any great weight 

 at all. Incidentally, this shows how badly all calculations 

 of Richards are muddled and off. 



