TELLURIUM. 275 



First. HJcO, to TeO,. 



//gTeOg. Loss in IVeight. Percent. TeO.^. 



1.7218 .5260 69.451 



2.S402 .8676 69.453 



4.0998 1.2528 69.442 



3.0916 .9450 69.433 



1. 1 138 .3405 69.429 



4.9S43 1-5236 69.432 



4.6716 1.4278 69.437 



Mean, 69.440, ± .0024 



Hence Te = 126.209. 



Second. H^TeO^ to Te. 



H^TeO^. Loss in IVeight. Percent. Te. 



1.2299 .5471 55-517 



1. 0175 -4526 55-5'S 



2.5946 1. 1549 55488 



Mean, 55.508, rh .0068 



Hence Te = 126.303. 



Staudenniaier also gives four reductions of TeO. to Te, in presence of 

 finely divided silver. The data are as follows : 



TeO^. Loss in Weight. Per cent. Te. 



.9171 .1S39 79.948 



I 9721 .3951 79.966 



2.41 15 .4S35 79950 



1. 0172 .2041 79-935 



Mean, 79.950, it .0043 



Hence Te = 126.636. 



The last series, giving the percentage of tellurium in the dioxide, com- 

 bines with previous series thus : 



Berzelius 80.042, =h .0050 



Wills, first series 80.015, ± .0410 



Wills, second series 80.028, zb .0040 



Brauner, synthesis 79. 7 1 1 , =h .0239 



Brauner, analysis 79-932, ± .0534 



Staudenmaier 79-9507 ± .0043 



General mean 80.001, ±: .0025 



The very recent determinations byChikashige* were made b}^ Brauner's 

 method, giving the ratio between silver and TeBr^. In all essential par- 

 ticulars the work resembles that of Brauner. except that the tellurium, 



* Journ. Chem. Soc, 69, 881. 1896. 



