ATOMIC WEIGHTS 



389 



Mean of all as one series, 103.644, 



.0018 



Hence Te = 137.57. A reduction of the weighings to a vacimra raises 

 this by 0.07 to 127.64. 



Still another series of analyses, made with fractionated material, gave 

 values for tellurium running up to as high as 137. These experiments 

 led Brauner to believe that he had found in tellurium a higher homo- 

 logue of that element, a view which he has since abandoned/ Brauner 

 also made a series of analyses of tellurium dibromide, but the results 

 were unsatisfactory. 



In the series of determinations by Gooch and Howland * an alkaline 

 solution of tellurium dioxide was oxidized by means of standard solu- 

 tions of potassium permanganate. This was added in excess, the excess 

 being measured, after acidification with sulphuric acid, by back titration 

 with oxalic acid and permanganate. Two series are given, varying in 

 detail, but for present purposes they may be treated as one. The ratio 

 TeOj : : : 100 : x is given in the third column : 



Mean, 10.068, ± .0100 



Hence Te= 126.92. 



In Staudenmaier's ' determinations of the atomic weight of tellurium. 



i.Journ. Chem. Soc, 67, 549. 1895. 



* Amer. Journ. Sci., 58, 375. 1894. Some misprints in the original publication have been kindly 

 corrected by Professor Gooch; hence the differences between these data and the figures formerly 

 given. 



3 Zeitsch. anorg. Chem.. 10, 189. 1895. 



