ANTIMONY. 195 



336.64 

 338.01 

 336.83 

 337-93 

 338.59 

 335-79 



Mean, 337.30, ± .29 



From this, if K.Cr.O^ = 29-i.64, Sb = 119.8. 



The newer atomic weights found in the previous chapters 

 of this work will be applied to the discussion of all these 

 series further along. It may, however, be properly noted at 

 this point, that the probable errors assigned to the percent- 

 ages of oxygen in three of Kessler's series are too low. 

 These percentages are calculated from the quantities of 

 KCIO3 involved in the several reactions, and their probable 

 errors should be increased with reference to the probable 

 error of the molecular weight of that salt. The necessary 

 calculations would be more laborious than the importance 

 of the figures would warrant, and, accordingly, in comput- 

 ing the final general mean for antimony, Kessler's figures 

 will receive somewhat higher weight than they are legiti- 

 mately entitled to. 



Naturally, the concordant results of Dexter, Kessler, and 

 Dumas led to the general acceptance of the value of 122 for 

 antimony as against the lower figure 120 of Schneider. 

 Still, in 1871, Unger* published the results of a single anal- 

 ysis of Schlippe's salt, Na3SbS4.9IT2 0. This analysis gave 

 Sb = 119.76, if S = 32 and Na = 23, but no great weight 

 could be attached to the determination. It served, never- 

 theless, to show that the controversy over the atomic weight 

 of antimony was not finall}'' settled. 



More than ten years after the appearance of Kessler's 

 second paper the subject of the atomic weight of antimony 

 was again taken up, this time by Professor Cooke. His re- 

 sults appeared in the autumn of 1877,t and were conclusive 

 in favor of the lower value, approximately 120. For full 



* Archiv. der Pharmacie, 197, 194. Quoted by Cooke. 

 f Proceedings American Academy, v. 13. 



