144 SMITH AND EXNER — ATOMIC WEIGHT OF TUNGSTEN. [April 7, 



In the calculations the values for oxygen and chlorine were taken 

 at 1 6 and 35.45 respectively. The specific gravity of tungsten tri- 

 oxide was found to be 7. 15 7 and that of tungsten hexachloride 3.518. 



Seven different series of determinations were made, each from a 

 different sample of hexachloride. The results appear in the sub- 

 joined table : 



It should be mentioned here that at the conclusion of these experi- 

 ments etching or corrosion of the glaze of the crucibles could not 

 be observed. Nor was there any stain upon them; they looked as 

 if they had been unused. 



