TELLURIUM. 269 



For Sr as mean between Ca and Ba, we should have 88.5. 

 The only positive result is that the atomic weight of 

 Strontium remains unknown. 



Te. TELLURIUM. 



We will make use of this case to show how closely this 

 work comes under the determination of the most probable 

 formula in ordinary chemical investigation. 



The atomic weight of tellurium having been much in 

 doubt, presents a favorable case for this parallel. 



We shall limit ourselves, as ordinarily, to dry way pro- 

 cesses with oxygen compounds. 



Telluric Oxide, Te Oa, and crystallized Telluric Acid, 

 Ho Oo Te are the only compounds to be considered. We 

 give the atomic ratios for Te from 124 to 128. 



Te. Te : Oxide. Oxide : Acid. Te : Acid. 



124 0.79 487 



125 618 0.69 163 0.55 066 



126 747 298 262 



127 874 432 458 



128 o.So ooo 566 652 



Chg. 13 13 20 



The change for o.i is given to nearest unit only. 

 Te : Te Oz, Analytical Determinations: 



Berzelius, 1833, 3 Det., 057034; 23. Mean 0.80 042 



Wills, 1879, I Series,* 5 Det., 207 828; 379. " O1 5 



II Series, 4 Det., 040 012; 28, " 028 



Brauner, 1889, 5 Det., 798 625 ; 173. " 0.79711 



i Det., by reduction. 932 



Staudenmaier, 1895, 406^,966935; 31. 950 



by reduction. 



Same, Oxide : Acid, 7 Det., 553429; 124. 0.69 440 



Same, Te : Acid, 3 Det., 518488; 30. 0.55 508 



These determinations, reduced oy the usual method of 



* Oxidized by Nitric Acid, which is known to be an imperfect agent 

 or tellurium ; hence great range. 



