200 HINRICHS— ATOMIC WEIGHT OF VANADIUM. [April 21, 



weights from the experimental work done in the laboratories, we 

 may proceed to the full statement of the facts obtained for the ele- 

 ment vanadium during the past eighty years and the final results of 

 our discussion of the same. 



We shall present the facts in the most compact form of tables and 

 finally exhibit them to the eye in the form of accurately drawn 

 graphics, from which we shall be able to read the final result the 

 most readily and clearly. 



THE ACTUAL DETERMINATION OF THE TRUE ATOMIC WEIGHT 



OF VANADIUM. 



I. — Absolute Atomic Data. 



Fundamental Constants, Calculated from the Absolute Atomic 



Weights. 



Only seven'"'^ chemical reactions have been used for the determi- 

 nation of the atomic weight of vanadium, thus far ; they are the 

 following : 



No. 98 : Pentoxide reduced by hydrogen. 



No. 269 : Oxychloride to silver. 



No. 270: Oxychloride to silver chloride. 



No. 311: \^anadate to chloride. 



(o) — Oxychloride to pentoxide. 



{b) — Sulphate to barium sulphate. 



(c) — Sulphate to pentoxide. 



The last three preliminary methods of Berzelius have been used 

 by him, each once only, and by no other chemist, except that Roscoe 

 made four determinations according to method (a). No. 311 has 

 but just been introduced by Edgar F. Smith, December, 19 10. All 

 the chemical reactions used for the determination of the atomic 

 weight of vanadium, up to that date, were devised and first used 

 by Berzelius in 1831, eighty years ago. It seems that his work has 

 some scientific value, after all. 



In the following Table I. we have given the most important fun- 

 damental constants required by our method of reduction. They 

 have all been calculated from the well-known absolute atomic 

 weights: Va, 51; T, 16; CI. 351/^; Ag, 108; Na, 23; S, 32; Ba, 



'" If we count 269 and 270 as distinct reactions. 



