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



2. Oxidation of Metal. 



Schneider (3). 



Marchand (2). 



Borch (2). 



Bernoulli (4). 



Roscoe (2). 



Pennington and Smith (9). 



Schneider (3). 



Hardin (37). 



A total of 62 oxidations. 



3. Weighing the Water from the Reduction of Trioxide. 



Riche (2). 



Smith and Desi (6). 



4. Determination of the Water Content of Barium 

 Metatungstate. 



Scheibler (5). 

 Hardin (2). 



5. Analysis of Tungsten Hexachloride. 

 



Roscoe (2). 



6. Analysis of Iron Tungstate. 

 Zettnow (4). 



7. Analysis of Silver Tungstate. 



Zettnow. 



8. Determination of the Water in Sodium Tungstate. 



Thomas (22). 



The results obtained by the first and second methods are the 

 most numerous. The frequent employment of these methods 

 would indicate the opinion to be general that they are the most 

 rational. This they are, notwithstanding the want of concordance 

 evident in the work of all chemists who have pursued either one of 

 these methods in the attempt to solve the existing problem. Their 

 sufficiency has been doubted, especially by Hardin, working in this 

 laboratory. He was disposed to attribute the lack of agreement in 



