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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 54 



basic nitrate, TeaHNOT- This compound was reduced by careful heating 

 to TeOo. In series II, as given below, the tellurium was purified by 

 distillation in a vacuum; in series I that precaution was not taken. 

 Weights not reduced to a vacuum : 



Nitrate. 

 2.9373 

 2.7982 

 2.8554 



Series I. 

 TeO,. 

 2.4522 

 2.3361 

 2.3840 



Per cent. TeO^ 

 83.485 

 83.486 

 83.491 



Mean, 83.5103. ± .0009 

 Hence Te = 137.57. 



In 1902 Scott ' published a preliminary note on the atomic weight of 

 tellurium. Analyses of trimethyl tellurium iodide and bromide were 

 made, the ratio with silver iodide being determined in the first case and 

 the titration ratio with silver in the second. I subjoin Scott's figures, 

 with the ratio to 100 Agl and I'lOAg, respectively. Vacuum weights 

 are given : 



(CH,),TeI. Agl. Ratio. 



1.7461 1.3688 127.564 



6.6425 5.20575 127.570 



8.0628 6.3181 127.614 



Mean, 127.583, ± .0105 



Hence Te = 127.56. 



Mean, 234.263, ± .0391 



Hence Te= 137.72. 



' Proc. Cheni. Soc, 18, 112. 1902. 



